I'm not Mormon and haven't read through all of this thread, but I did want to comment on this. For several reasons, my wife and I started stocking up on food and other supplies about 3 or 4 years ago. For the bulk items(wheat, rice, beans, etc), we have bought those either through ldscatalog.org or directly through an LDS cannery(I think that's the what they are called) that's not too far away. The prices are very reasonable for these kind of items(especially since some of them come in cans or you can can them on site) and the people I have met at the cannery have been the friendliest people you will ever meet.
If you are just getting started or are on a limited budget, I would definitely see what they have available since you'll probably be able to get a lot of food without spending too much money.