I suggest that people make their own bread. It's very easy and it's almost impossible to fail. I used to make my own bread, very barebone when I was broke. I just used 3 cups of white flour, 3 tea spoon of instant yeast and about 1 cup of tepid water... Don't forget to at least add 1 tea spoon of salt or else it really doesn't taste good. You can naturally improve on it and buy flour meant for making bread which has more gluten or something, and go fancier with regular yeast and so on but this is a really quick and easy method that works.

So next step after storing water would be to learn to make bread and soup, since you cannot survive only with bread but you can with bread and soup.

Frankie