My thoughs on food:
SPAM, the flavoring packets from Ramen, most canned anything not fruit and bullion have a lot of salt, not good if you're in a dry &/or hot environment &/or working and sweating a lot. Might be good though once you're settled in and have a decent water source.
I would think that one of those vacuum sealer deals would be ideal for packing food. Those bags weigh a lot less than your average can, will pack much easier and you can punch a hole or two in the top of the bag, stick it in a pot of hot water and cook your soups, stews, etc... like that. You'll have a handy container and you'll waste less water washing dishes. You can also cook things in the cans they come in, but again you're dealing with more pack weight and it'll be harder to conceal your trash than empty vac-seal bags. The empty bags can also be used for covering a open chest wound that involves a punctured lung (pneumo thorax).
Might want to consider the "instant" foods as well like the Uncle Ben's rice packets, flavored oatmeals and things like powdered milk and potatoes. Less cook time means less down time for you and the reduced weight and space mean more food/gear/water/etc... Down side is that some of those things take more water than the "regular" version, but then again, some take a LOT less.
Coffee is both a diuretic and can have a laxative effect on some people. Not bad if you keep it tamed with a healthy consuption of water and it could help even you out if you're consuming mostly MRE's or similarly "clogging" foods, but something to keep in mind. Moderate consumption is probably OK, but some people drink coffee from the time they wake up until they pack it in for the night, that could create a lot of issues for you if you're on the run, especially if you're having to drastically cut back on your consumption (caffeine withdrawls can be kinda nasty).
One thing to keep in mind is the physical and mental effects some foods/drinks can have on you. Use these to your advantage. Running out of steam for that last little push? Grab the container of Folger's Crystals, munch down a few ounces and get moving. Morale dropping? Pass out some chocolate or candy. Mouth getting dry and throat sore? Grab a couple Jolly Ranchers. Getting colder than you should be after a hard day? Throw down some high carb/high fat content food and you'll warm up.
Old news, but eat before you're hungry and drink before you're thirsty. Even if you're just taking sips and bites every 10-15 minutes it'll keep you going much better than sitting down for "3 squares" a day while you're on the move.
