Long-Term Water Storage for Preparedness

How Much Water You Need

Before buying containers, calculate the requirement.

Daily requirement per person:

• Drinking only: 0.5 gallons minimum
• Drinking + cooking: 1 gallon minimum (FEMA standard)
• Drinking + cooking + basic hygiene: 2-3 gallons
• Full comfort including sponge bathing, dishes: 5-7 gallons

Family of four, 30-day supply, comfort standard (3 gallons/person/day): 4 people × 3 gallons × 30 days = 360 gallons

At 360 gallons of storage, you're looking at six or seven 55-gallon drums.

The incremental approach: Start with the FEMA 2-week minimum (4 people × 1 gallon × 14 days = 56 gallons — a single 55-gallon drum). Build from there toward longer time horizons.

Don't forget: pets also need water (approximately the same as a small child), and sanitation (toilet flushing) requires 1-3 gallons per use if you're trying to maintain flush toilet function.

Container Types

WaterBOB (100-gallon Bathtub Bladder)

A single-use polyethylene bladder that fits inside a standard bathtub, fills from the faucet (with a hand pump for dispensing), and holds up to 100 gallons. The bathtub acts as a structural support.

Best use: Immediate emergency water filling when you have warning (before a hurricane, before a forecast extended power outage). Fill the moment you have warning — the whole process takes 20 minutes.

Limitations: Single-use, requires knowing in advance, sits unused in a closet until needed. But at approximately $30, it's the highest-value water preparedness item available.

5-Gallon Jugs

Food-grade HDPE or polycarbonate 5-gallon containers with handle and screw-top cap. Available at most big box stores, sporting goods stores, and camping retailers.

Best use: Flexible and portable. Easy to handle individually. Can be stacked. Good for supplementing bulk storage with portable supplies.

Limitations: 10 containers for 50 gallons takes up significant shelf space and requires 10 separate fill operations.

Stack safely: No more than two high without a rack. Stacked higher they become unstable.

55-Gallon Barrels

Heavy-duty HDPE barrels, the standard for serious bulk water storage. 55-gallon drums store 18 months of water for a single person at minimum consumption, or a family's 2-3 week supply each.

Best use: Long-term fixed storage. Once full and sealed, largely maintenance-free.

Weight: 55 gallons of water weighs approximately 458 lbs. This barrel does not move. Place it where you want it before filling.

Access: Requires a barrel bung wrench (to open the bung holes), a hand pump or siphon to extract water, and a pre-filter on the water entering the barrel.

See the dedicated 55-gallon drum setup article for complete installation and maintenance procedures.

250-Gallon IBC Totes

Intermediate bulk containers — a large cube-shaped food-grade plastic tank inside a steel frame. Used in industrial food and beverage production.

Best use: Community or large family storage. One IBC tote holds more than four 55-gallon drums at roughly the same cost.

Secondhand market: Food-grade IBC totes used for food or beverage service can often be found at significant discount. Avoid IBC totes that held chemicals.

Inspect before purchasing: The plastic inner container should be clear to translucent (not opaque or discolored from chemical storage), and the previous contents should have been food or beverage grade.

Commercial Water Bottles and Cases

Pre-packaged commercial water (the gallon jugs or case-packs of individual bottles) is the easiest stockpile — no setup required, rotation is clear from the dates, and they're entirely self-contained.

Best use: Immediate emergency supply, supplementing bulk storage, go-bag water.

Cost: Most expensive per gallon of the options listed. At scale (a family's 2-week supply), commercial bottles get expensive and generate significant plastic waste.

Storage Conditions

Water quality is affected by light, heat, chemical contamination from nearby storage, and container integrity. Optimal conditions:

Cool temperature: Below 70°F is ideal. High temperatures don't harm the water chemistry but accelerate algal growth if the container is ever compromised. Also, heat degrades plastic containers over time. Avoid locations that get hot in summer (uninsulated garage, attic).

Darkness: UV light degrades plastic containers and promotes algal growth. Store away from windows. Dark-colored or opaque containers are better than clear for long-term storage.

Away from chemicals: Gasoline, pesticides, fertilizers, cleaning products, and paint can permeate through thin plastic containers and contaminate water. Keep storage water separated from chemical storage.

Off the ground: Concrete floors can leach chemicals into plastic containers over time (especially clear plastic). Store on wooden pallets or shelving.

Away from heat sources: Furnaces, water heaters, and direct HVAC vents. Temperature stability matters more than any specific temperature.

Treating Water Before Storage

From the tap: Tap water from a municipal supply already contains chlorine — no additional treatment is needed for storage. Fill clean containers directly from the tap.

From a well: Well water may not have chlorine. Add 1/8 teaspoon of plain bleach per gallon before sealing containers for long-term storage.

Commercially bottled: No additional treatment needed. Use before the date on the bottle (or add another year to it as a practical matter).

Previously opened containers: If the container seal has been broken, treat as tap water and store for 6 months maximum.

Rotation Schedule

Tap water in sealed food-grade containers: replace every 6-12 months. The water itself is fine indefinitely, but chlorine dissipates (leaving the water vulnerable), and any small contamination from the container or the filling process can grow over time.

Rotation approach:

• Use the oldest stored water for cooking, pets, watering plants, or garden use
• Refill and date the container
• This keeps your supply perpetually fresh

To make rotation painless: Label each container with the fill date using a marker on masking tape. Work through oldest first.

For 55-gallon drums: Taste the water annually. If it tastes flat or off, add 1/2 teaspoon of bleach and wait 30 minutes before using (this refreshes the chlorine and kills any incipient bacterial growth). Every 2-3 years, empty and clean the drum with a bleach solution before refilling.

Survival Math: One Week vs. One Month vs. One Year

| Goal | 1 Person | Family of 4 | |---|---|---| | 1 week (1 gal/day) | 7 gallons | 28 gallons | | 2 weeks (FEMA min) | 14 gallons | 56 gallons — 1 drum | | 1 month (comfort, 2 gal/day) | 60 gallons | 240 gallons — 4 drums | | 3 months (extended disruption) | 180 gallons | 720 gallons — 13 drums |

Most preparedness resources recommend working toward 2-4 weeks. Beyond that, water storage becomes a significant physical and financial undertaking — at some point, water treatment and sourcing capability (filters, purification methods, access to natural sources) is more practical than pure storage.