http://swissbaync5d7ykaz7dh7v4qjrb4gmen5aj3bogxrcgbb43ij34bjuyd.onion/pdf/Books/Survival/Survival/nuke.html
Evaporated milk has a nutritional life of 6 months; bouillon, instant cream, nuts, cereals, and hydrogenated (or anti-oxidant treated) fats/vegetable oil all have nutritional shelf lives of a year. About the only things worth eating after a year are coffee, tea, cocoa, candy (that isn't nearly 100% sugar), or spices like sugar, salt, pepper, etc. So even IF you have a grocery store to use for supplies, the nutritional value of the food will be nearly nill...