http://swissbaync5d7ykaz7dh7v4qjrb4gmen5aj3bogxrcgbb43ij34bjuyd.onion/pdf/Books/Survival/Survival/nuke.html
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 after a year.