I have little water pouches similar to this. I've been using them for about two years now and have not had any issues. Since the pouches are obviously flexible, they don't break in freezing weather. I keep a bag with all of my emergency stuff in the trunk, and I keep these little water pouches inside medium-sized zipper pouches inside the main bag so they are less likely to get punctured by something.
As for food, that's a secondary concern, but I just keep some brownie MREs in the bag.