I got the notice a while ago suggesting to fill up old juice or soda bottles for emergency water supply. I know I need 1 gallon per person per day, but I was just wondering how often the water needs to be changed out to keep it safe and fresh?
Here's what ProvidentLiving.org says, it really doesn't say how long it is good for, it just says to empty and refill regularly.
Containers should be emptied and refilled regularly.
Store water only where potential leakage would not damage your home or apartment.
Protect stored water from light and heat. Some containers may also require protection from freezing.
The taste of stored water can be improved by pouring it back and forth between two containers before use.