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Many people store water for emergencies like hurricanes and power failures.
This is especially true in rural areas where drinking water comes from private wells. These wells are useless unless there is power to run the pump. It turns out that there are two ways for water to go bad. You can easily demonstrate the first way by filling a bucket with tap water and leaving it on the back porch for several days. After about a week you will find that the water in the bucket contains mosquito larvae, algae and various other life forms, none of which you would want to be drinking.