"Two quarts (half gallon) of water each day." (The FEMA guideline) can add up fast!

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2 quarts a day X 365 days a year = 730 quarts a year OR 182.5 gallons

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Keep in mind these numbers are per person. And that is just what is consumed. Those numbers don't include cooking or waste disposal. So, obviously storing as much ready to go water as you can just makes sense. Both filtered AND unfiltered.