Plug in your group size, climate, and how active everyone is — we'll do the math using FEMA and Red Cross guidelines so you don't have to. The calculator figures out exactly how many gallons you need per day, then recommends containers and purification gear that actually fit your living situation. Apartment with no garage? We'll skip the 55-gallon drums and suggest stackable options instead.
Bottom line: water is the one thing you absolutely cannot wing. This tool takes the guesswork out so you can store with confidence and stop second-guessing whether you have enough.