Yes, I also have several sources of water. Besides storing, there is always the toilet tank. When I mentioned that to my non-camping (much less bpacking) wife. They thought it was gross. They would or will be happy when I filter clean water from the many sources that are available. As far as the runs on the stores, this whole idea of being prepared is my point exactly. I'm sure most people think they are resourseful and think in an emergency everything will work out. That's why I want to put together a decent, well thought out kit that people can use. KISS is the key. Pictographs, instructions, whatever it takes to show them how to use the equipment and supplies properly. Another key will be relative comfort in a bad situation. Of course, that means being able to get to your stash.
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Enjoy your next trip...