[driftdiver]

Water doesn’t go bad but the containers its stored in do. Depending on the container they can break down and contaminate the water. Likewise stored water is heavy and space intensive.

The basic act of using the water can introduce bacteria and other contaminates which will make it unsafe to drink.

[Kartographer]

I recommend if you have room get one of these:

You can find them sometimes on Craigslist.