Emergency Water Storage: How Much You Need and Best Ways to Store It

Water is the single most critical supply in any emergency. You can go weeks without food, but only about three days without water — less in hot weather or if you’re physically active. Despite this, water storage is one of the most overlooked parts of family preparedness. When I audit families’ emergency setups, water is almost always the weakest link.

The good news: building a proper water supply is straightforward and surprisingly affordable. Here’s exactly how to do it.

The One-Gallon-Per-Person-Per-Day Rule

FEMA and the American Red Cross both recommend the same baseline:

1 gallon of water per person per day

That covers both drinking and basic sanitation (hand washing, dish rinsing). But this is a minimum for a temperate climate with moderate activity. You’ll need more if:

• It’s hot (summer, southern climates) — plan for 1.5 gallons/person/day
• You have nursing mothers — add 0.5 gallon/day
• Someone is sick or injured — add 0.5–1 gallon/day
• You have pets — 1 oz per pound of body weight per day (a 50-lb dog needs ~0.4 gallon/day)
• You’re doing physical labor (cleanup, repairs) — add 0.5 gallon/day

Family Water Calculations

Here’s a quick reference table for a standard family with no special considerations:

FEMA recommends a minimum 3-day supply. I recommend at least a 7-day supply for most families, and 14 days if you live in an area prone to hurricanes, earthquakes, or other disasters that can disrupt water service for extended periods.

For our family of four, I maintain a 14-day supply of roughly 60 gallons. It takes up a 4x2 foot footprint in the garage and cost about $85 to set up.

Best Water Storage Containers

Not all containers are created equal. Here are the options I’ve tested, from small-scale to serious capacity.

Store-Bought Water Bottles & Gallon Jugs

Best for: Starting immediately, grab-and-go kits Cost: $1–$2 per gallon Shelf life: 1–2 years (manufacturer date), functionally longer if stored properly

The simplest approach: buy cases of bottled water or gallon jugs from the grocery store. Stack them in a closet and you’re done. The plastic is food-grade and sealed at the factory.

Downsides: More expensive per gallon than other methods, creates plastic waste, takes up more space due to inefficient shapes, and the thin plastic can degrade over time — especially in heat.

I keep two cases of bottled water in the front closet as the first-grab supply. But for longer-term storage, purpose-built containers are smarter.

Reliance Aqua-Tainer (7 Gallons) — Best All-Around Container

Price: ~$16 each | Capacity: 7 gallons

The blue Reliance Aqua-Tainer is the workhorse of the emergency water world. I’ve used these for six years, and they’ve earned their reputation.

Why I like them:

• Rigid, stackable design — two containers fit neatly on a shelf
• Built-in spigot makes dispensing easy without contamination
• 7 gallons is heavy (about 58 lbs when full) but still manageable for one person to carry
• BPA-free, food-grade polyethylene
• Wide mouth for easy filling and cleaning
• Affordable enough to buy 4–8 for a full family supply

My setup: I have eight Aqua-Tainers in the garage, giving us 56 gallons — a solid 14-day supply. Total cost: about $130.

Tip: Stand them up vertically to minimize the footprint. They stack two-high safely on a level surface.

WaterBOB (100 Gallons) — Best Last-Minute Bathtub Solution

Price: ~$35 | Capacity: 100 gallons

The WaterBOB is a large food-grade plastic bladder that sits inside your bathtub. When a storm warning hits, you fill it from the faucet — and it holds up to 100 gallons of clean water that stays sanitary for weeks.

Why I like it:

• 100 gallons is a massive water reserve — enough for a family of four for nearly a month
• Uses water pressure from your home’s supply before it potentially goes out
• Keeps water clean and contained (unlike just filling the tub, where soap residue and contamination are issues)
• Comes with a pump for dispensing
• Disposable — designed for single emergency use

Downsides:

• You need advance warning to fill it (hurricane approaching = great; earthquake = useless)
• Ties up your bathtub for the duration
• Single-use product
• Only works if your water supply is still pressurized when you fill it

I keep a WaterBOB in the bathroom closet year-round. When we get a hurricane watch, filling it is step one of our storm prep. It’s a perfect complement to your stored containers — think of it as surge capacity.

55-Gallon Water Drum — Best for Serious Storage

Price: ~$50–$80 (new, food-grade) | Capacity: 55 gallons

A single 55-gallon drum provides a substantial water reserve for a family. These blue HDPE drums are the standard for long-term water storage.

Important considerations:

• A full 55-gallon drum weighs approximately 460 pounds — place it where you want it before filling
• Requires a bung wrench to open and a siphon pump to dispense
• Must be food-grade and new (or certified cleaned) — never use drums that held chemicals
• Needs water preserver concentrate for long-term storage (5-year shelf life with treatment)
• Place on a pallet or boards, not directly on concrete (concrete can leach chemicals through HDPE over time)

I have one 55-gallon drum on a pallet in the corner of our garage, treated with Aquamira water preserver. Combined with the Aqua-Tainers, that gives us over 110 gallons total — about a month’s supply.

IBC Tote (275 Gallons) — Maximum Home Storage

Price: $60–$150 used, $250+ new | Capacity: 275 gallons

Intermediate Bulk Containers (IBC totes) are the commercial-scale option. They hold 275 gallons in a metal cage with a built-in valve.

Considerations:

• At 2,300 lbs full, this is a permanent installation — garage floor or outdoor pad only
• Must verify the tote is food-grade and previously held only food-safe materials
• Needs UV protection if stored outdoors (sunlight promotes algae growth through the translucent walls)
• Excellent cost-per-gallon for large families or those in disaster-prone areas

For most families, the Aqua-Tainer + 55-gallon drum combination is more practical. IBC totes make sense for rural properties, large families, or regions where water disruptions commonly last weeks.

Water Treatment for Long-Term Storage

Tap water from a municipal supply is already treated and safe. For long-term storage beyond a few months, you have two reliable options:

Option 1: Household Bleach

Add 8 drops (1/8 teaspoon) of unscented liquid chlorine bleach per gallon of water. The bleach must contain 6–8.25% sodium hypochlorite with no additives. This is the EPA-recommended method.

Treated water stored in clean, food-grade containers in a cool, dark location is safe for 6–12 months before re-treatment is recommended.

Option 2: Water Preserver Concentrate

Products like Aquamira Water Preserver (~$15 for 55 gallons) extend safe storage to 5 years without rotation. This is what I use for the 55-gallon drum — the convenience of set-it-and-forget-it is worth the cost.

Water Purification Methods (For Unknown Sources)

If you need to use water from uncertain sources (streams, rainwater, questionable tap after a main break), have at least one purification method available:

I keep a Sawyer Squeeze filter and a bottle of Aquamira drops in our emergency kit. The Sawyer filters up to 100,000 gallons and weighs 3 oz — it’s remarkable technology for the price.

Note: Most portable filters do NOT remove viruses. For virus protection, you need chemical treatment (bleach, iodine, Aquamira) or boiling. In the US, viruses in freshwater are rare, so a quality filter is usually sufficient for domestic emergencies.

Where to Store Your Water

Location matters for both safety and quality.

Best storage conditions:

• Cool (50–70°F ideal), dark location
• Away from direct sunlight (UV degrades plastic and promotes algae)
• Off the ground (on pallets, shelving, or raised platform)
• Away from gasoline, pesticides, or chemicals (vapors can permeate some plastics)
• On a structurally sound floor (water is 8.3 lbs/gallon — 55 gallons = 460 lbs)

Common storage locations:

• Garage (most popular, but watch summer heat in hot climates)
• Basement (ideal temperature, watch for flood risk)
• Utility room or closet
• Under stairs

Avoid storing water:

• In direct sunlight or outdoor heat
• Next to chemical storage
• On the second floor (weight concerns with large containers)
• In areas that flood

Rotation Schedule

Even properly treated water should be rotated to maintain quality.

My rotation system: I set a calendar reminder every March and September. In March, I rotate the Aqua-Tainers (empty into the garden, refill from tap, re-treat). In September, I check the 55-gallon drum’s treatment date. The WaterBOB doesn’t need rotation since it’s filled fresh before each use.

Make water rotation part of your overall emergency preparedness checklist — schedule it alongside smoke detector battery changes and go-bag reviews.

Quick-Start Plan: Get Your Water Storage Done This Weekend

Saturday morning (1 hour, ~$85):

1. Buy four Reliance Aqua-Tainers (4 × ~$16 = $64)
2. Buy one bottle of unscented bleach ($4)
3. Buy a Sawyer Squeeze filter ($30 — optional but recommended)
4. Clear space in the garage or basement

Saturday afternoon (30 minutes):

1. Fill each Aqua-Tainer from the tap
2. Add 56 drops of bleach per container (8 drops × 7 gallons)
3. Seal, label with the date, and stack
4. Set a 6-month calendar reminder to rotate

Congratulations — you now have a 7-day water supply for a family of four. Total cost: under $100. Total time: under 2 hours.

To scale up to 14 days, add a 55-gallon drum ($50–$80) with Aquamira preserver ($15) when budget allows.

Frequently Asked Questions

Can I store water in milk jugs or juice containers?

The FEMA guidelines specifically recommend against using milk jugs. The milk proteins are nearly impossible to fully remove, and they promote bacterial growth even after washing. Juice containers with screw-on caps are acceptable if thoroughly cleaned with hot soapy water and sanitized with a diluted bleach solution — but purpose-built containers are safer and more durable.

Does stored water go bad?

Water itself doesn’t expire, but the container and any residual chlorine can degrade. Stored water may develop a flat taste as dissolved oxygen escapes, but that doesn’t make it unsafe. The concerns with old stored water are: bacterial growth (if not properly treated), plastic chemical leaching (if stored in heat or direct sun), and contamination from nearby chemicals. Properly treated water in food-grade containers, stored in cool/dark conditions, remains safe for years.

How do I store water if I live in an apartment?

Space is tight, but options exist. Four Aqua-Tainers (28 gallons) fit in a closet corner. Cases of bottled water slide under beds. A WaterBOB in your bathtub provides surge capacity when you have warning. For a family of two, even 14 gallons (two Aqua-Tainers) covers a full week. Start small and build up. Every gallon stored is a gallon you don’t have to find during a crisis.

Is rainwater safe to drink in an emergency?

Freshly collected rainwater is generally safer than surface water (streams, ponds) but is not sterile. It can contain airborne pollutants, bird droppings from collection surfaces, and bacteria from storage containers. In an emergency, filter and treat it before drinking — boil for 1 minute, or use a filter plus chemical treatment. For routine collection systems, the CDC rainwater collection guide has detailed safety recommendations.

Should I store water purification tablets in addition to filters?

Yes. Redundancy is key in water preparedness. Filters can break or clog. Chemical treatments work when mechanical filtration fails. I carry both a Sawyer Squeeze filter and Aquamira drops in our emergency kit. The tablets/drops weigh almost nothing and serve as critical backup. Include this in your power outage kit checklist too — water purification ability matters even in a simple blackout if your municipal water supply is compromised.

The Bottom Line

Water storage is the highest-impact, lowest-cost preparedness step you can take. For under $100 and two hours of work, you can have a week’s supply for your family. Scale up to a 55-gallon drum when budget allows, keep a WaterBOB for surge capacity, and maintain a filter for unknown sources.

The families who struggle most after disasters are the ones who assumed the tap would always work. Don’t be that family. Start this weekend — your future self will thank you.

For more on building out your complete family emergency readiness, see our emergency preparedness checklist for beginners and our family emergency plan template.