Always take some onion, celery and carrots to cut up into whatever ya got; it richens up Ramen (which is my basic 'starter soup kit'). They are kinda my 'three sisters' for most all my cooking. Even though canned stuff usually has a high moisture content I tend to carry some on any trip, and now there are some dandy non-frozen 'microwave' meals' at every grocery store (often on sale at W-Mart for like $2.49) that dont have to be nuked, Ive opened 'em up, dumped in a pan, added boiling water and just cooked some more over whatever flame I have and they are as good as out of the nuker.
Always take salt, pepper and curry powder (if you can stand it, I know some dont). Some of it for my spiffed up Ramen Curry is good for me
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Early on eggs will last quite a few days unrefrigerated, but I like to use them soon, same with a small Summer Sausage, though Landejager (sp?) is good to go for the duration, just wrap either in some brown paper bag to sop any drippin's. Cheeses like XX Sharp Cheddar or aged Swiss are good the same way.
Most breads break down to mashed too quick for me but 'cocktail' mini loafs hold up much better, and some of the more HD crackers last the best (or make your own hardtack).
And 'Gorp'; I get nuts of several types, raisins, craysins, dates, whatever I like and make mine much cheaper than store-bought; its always good to grab & munch.
Some Fig Newtons make a pretty good snack or desert too.