Here is my routine:
clean out zip-locks and organize food bag in grocery store garbage can (usually at front of store)
breakfasts: carnation instant, pop-tarts, instant oatmeal, cliff bars, met rx protein bars, instant coffee (starbucks vias if I can get them)
lunches: GORP, Dried Fruit, Candy Bars, Cliff Bars, Nuts, Soy Stuff (tofurky, seitan bars?) tuna foil packs, etc.
dinners: mac and cheese, tortellini (I look for Barila Brand), instant refried beans, instant rice, tortillas, block cheese, instant potatoes, foil packs of tuna,
hot chocolate mix, candy bars, maybe a little junk food - - like a big bag of Snyders of Hanover Pretzel things
also, old fashioned jiffy pop pop corn backpacks pretty easily
I also carry curry powder and the hottest hot sauce I can find
have fun