It really doesn't have to be hard. I onced wintered, snowed completely in, for four months. My stock included a fair amount of canned meat, two bushels of wheat, a hand powered flour mill, two bushels of beans, and miscellanious dried fruit treats, a few bags of sugar, salt, pepper, and ketchep.
Water wasn't hard because there was a lake out front. I could always melt snow.
So don't forget to include some kind of cooking provision. Propane is nice, wood works but is a pain. Lots of matches.
I also had a Marlin 30-30 wit several hundred rounds, but there wasn't really anything to shoot.
During the Y2k paranoia, I had a friend stock up on $25,000 of supplies, including MREs and cases of canned water. He tried to get me to be worked up too. I responded by showing him a Berkey filter, (which removes bacteria and other nasties from water), a shelf full of Campbell's soup, and a plastic garbage can full of dried beans and another full of whole wheat. Total cost, including the water filter, was about $300. I knew I could survive for 4-6 months on that, supplemented by garden produce, even if I wasn't living very high on the hog. (I still have an arsenal, btw. Among other things, a Marlin camp rifle in 9mm is pretty useful as a small game gun. A thousand rounds of 9mm doesn't cost so much--it would get you through as long as you were not thinking of holding off an army).
As for beverages, just keep some wine always brewing. Drink as you go. No point in hoarding.
Vic
Whatever You Can Hold In Your Stomach! 
