The answer to your (deceptively simple) question is "it depends".
How many do you need to feed, for how long, under what conditions, how are you planning to store it, and how portable does it have to be?
The answer can be as simple as prepackaged, one year meal plans (e.g.
http://www.samsclub.com/sams/augason...Id=prod1970426, or
http://wisefoodstorage.com/, or
http://www.nitro-pak.com/) or as complicated as rolling your own from places like
http://www.rainydayfoods.com/ or the local LDS canneries (or whatever replaced them in your area). Personally, I've adopted a "defense in depth" approach with a two week supply of MREs and equivalents (highly portable, no prep required), a 3-month Wise kit (almost as portable, requires hot water, relatively inexpensive per calorie, easily stored, and going to be very difficult to get the wife to live off of it for an extended period [boring and bland]), and a "survive until the crops come in" rainydayfoods bulk purchase (heavy, not portable, very inexpensive per calorie unit, 30-year shelf life if properly stored, lots of work to make edible, and depending on starvation to make it palatable to people who can't handle boring survival food). I put a lifetime's experience and a lot of thought and research into what I've got now; it's adequate for my needs over a 12-18 month period but I'm still nervous about the outcomes. I doubt I've told you anything you haven't already considered so here's to Good Luck and the time and resources to develop and implement your plan.