All I can say is read the book: “One Second After”, then tell me how dumb this idea is...
http://www.onesecondafter.com/
No, I’m not a Mormon or survivalist...but I see the logic of it.
Water comes next. You can live without food for several days or more, but not without water. Identify fresh water sources and store and rotate out water.
Batteries, medicine, heat sources, durable goods and clothing. Nothing silly about it.
The biggest thing is networking. Connect with like-minded friends who also see dark times ahead. You'd be surprised how much folks have when they pool their resources (not just food).
Locate several friendly families that have places in the country with well water and wildlife on their land, or buy some of your own if you don't live there already.
Be prepared. When the SHTF, it's going to be bad.
If you can't get out of the city immediately (you'll only have a limited period of time before the roads get clogged and are unpassable), be prepared to live in your home for no less than 40 days without outside assistance. Most of the scum will kill each other off during that time fighting over meaningless crap. Rally your neighbors to defend your street, block, section, community.
Condense. It's easier to heat 1 home than several, easier to combine resources and cook for a group than just 1 or 2 people. Easier to defend one location with many weapons than several with just a few.
But above all remember - we are Americans. We can do ANYTHING.