This is a topic on everyones mind though we Americans are so predispositioned to convenience, we cannont give it much thought to have to live any other way. Stocking up sounds like a great idea though another day goes by and it doesn't happen.
I, like other people on this site, worry more about the starving city folk coming through our rural areas in search of anything they can use. The movies are just that, but pretty much any movie that takes place after a disaster shows the survivors holding out with big guns and I'm afraid that will be the case. When there is lawlessness, the people who form an army will win.
In my case, my mother just purchase 30 acres outside Lexington, VA. (pretty rural) It's WAY off the beatin path and we could even cover the drive with trees to hide it. (saw that on a movie too!) There is a strong creek, and plenty of forest nearby as well as pasture land. My father also owns a farm in MD outside a small town. Either one of those places would be where I'm headin. I've just started saving my seeds this year. -not cause Im worried, but because I'm being more frugal about everything. We are really learning how to pinch a penny and that is a good thing

But I will be ready with a good starter crop and some warm clothing...cause that's all you'll really need. Oh!! and a couple shotguns!
My csa was overwhelmed with second grade heirloom tomatoes (not very pretty, but still yummy) I couldn't pass any up so I've canned up the kazoo. To all of you who want to can, start with easy stuff like hot water bath canning. google it. It's super easy. Im trying this awesome yogaurt recipe on here too. Looks pretty simple.
We should all take a lesson in being more self-sufficient and make a plan. A large family can all band together on someones farm where everyone has a job. When you work together, things will be easier.
Here's to everyone being able and to never having to find out how able.