Urban Water Storage Calculator

Calculate Your Water Needs

Number of People:

Number of Days:

Activity Level:

Your Water Requirements:

gallons

0 lbs

Water Requirements By Use

Activity	Water Needed	Per Day (1 person)
Drinking	Minimum survival	0.5 gallons
Drinking + Cooking	Basic needs	1 gallon (standard recommendation)
Drinking + Cooking + Basic Hygiene	Hand washing, face cleaning	1.5 gallons
Full Hygiene	Bathing, laundry, dishwashing	2+ gallons

💡 Rule of Thumb: 1 gallon per person per day is the minimum. 1.5-2 gallons per person per day is comfortable. Plan for the higher end if possible.

Space-Efficient Storage Solutions

🧱 WaterBricks (3.5 gallons each)

Size: 9" × 18" × 6" (stackable)
Weight when full: ~30 lbs each
Where to store: Closet floor, under sink, behind furniture
2 units = 7 gallons (2 people, 3 days minimum)
4 units = 14 gallons (2 people, 7 days)

💧 5-Gallon Jugs

Size: ~10" diameter, 18" tall
Weight when full: ~42 lbs
Where to store: Closet, pantry, under bed (careful with weight)
Pros: Cheap, available everywhere
Cons: Heavy, bulky, hard to stack

🥤 1-Gallon Bottles

Size: Standard milk jug size
Weight when full: ~8.5 lbs each
Where to store: Kitchen cabinets, under bed, fridge
Pros: Easy to handle, fits anywhere, rotate easily
Cons: Takes more space than bulk containers

💦 Water Pouches (Datrex)

Size: Compact, individual serving pouches
Shelf life: 5 years (longest of any option)
Where to store: Backpack, glove box, tight spaces
Pros: Space-efficient, lightweight, long shelf life
Cons: More expensive per gallon, single-use

Storage Locations in Small Apartments

Under bathroom sink: 7-14 gallons (2-4 WaterBricks)
Kitchen lower cabinets: 5-10 gallons (bottles or jugs)
Bedroom closet floor: 7-14 gallons (stackable containers)
Under bed: 5-10 gallons (flat containers only, watch weight)
Behind furniture: 3-7 gallons (slim stackable containers)
Pantry/coat closet: 5-15 gallons (vertical stacking)

⚠️ Weight Warning: Water is heavy (8.3 lbs per gallon). Spread storage across multiple rooms to avoid stressing floors, especially in older buildings. 40 gallons = 330+ lbs.

Rotation Schedule

Container Type	Replace Every	Tips
Store-bought sealed bottles	6-12 months	Check expiration dates, rotate stock
Refillable containers (WaterBricks)	6 months	Drain, sanitize, refill
Water pouches (Datrex)	5 years	Longest shelf life, check for leaks

Emergency Water Sources (Backup)

Bathtub: Fill at first sign of emergency (40-60 gallons free backup). Use WaterBOB liner ($30) for sanitary storage.
Water heater: 30-50 gallons stored inside (requires turning off + draining valve).
Toilet tank: 1-3 gallons (NOT the bowl). Safe for drinking if no chemicals added.
Rainwater collection: If you have balcony. Filter/purify before drinking.
Ice from freezer: If power just went out, melt for drinking water.

Purification Methods

Boiling: 1 minute rolling boil kills bacteria/viruses (requires heat source)
LifeStraw/Sawyer filter: Removes 99.9% bacteria/protozoa (1,000+ gallons capacity)
Purification tablets: Iodine or chlorine dioxide (backup method)
Bleach: 8 drops unscented bleach per gallon, wait 30 min (emergency only)

💡 Pro Tip: Store water + purification method. If you run out of stored water, you can safely process questionable sources (bathtub, rain, streams).

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💧 Urban Water Storage Calculator

Calculate Your Water Needs

Your Water Requirements:

Water Requirements By Use

Space-Efficient Storage Solutions

🧱 WaterBricks (3.5 gallons each)

💧 5-Gallon Jugs

🥤 1-Gallon Bottles

💦 Water Pouches (Datrex)

Storage Locations in Small Apartments

Rotation Schedule

Emergency Water Sources (Backup)

Purification Methods

🧭 Take This Further — Two Tools Built for This

FieldScout

GridWatch