Engergy bars and the gel packs, the Amway people have an alternative to the gel pack which they make low carb and low sugar with creatine as the main ingredient. It works well. It is super efficient, made for runners to carry in a small pocket of their shorts or even in a sock like the Powergel.

A few cans of energy drinks, then a bottle or two of water. My kits will include an EMPTY 2 qt canteen which gets filled at some point during the exercise, the two small commercially packaged water bottles are supposed to last until then. The reason being that I noticed keeping filled canteens in a bugout kit causes more problems than it is worth with water going stale and whatnot.

Absolutely nothing that requires cooking or preparation in any way, shape or form.

A single large $5 bag of trail mix can easily last a day or two of moderate munching.

A real strategy is to run a high enough level of bodyfat that it does not tax your performance, but also makes it no big deal if you skip a couple of meals.

You feast a full day before the patrol, eat light the night before, light the morning of the op, then make sure you crap out what can be crapped out before actually heading out. Don't eat big on an op because that means you will have to make potty stops somewhere along the way, and the timing for that can turn out really really bad.

If you do have to eat, stick to sterilized packaged food which will not put you at risk of getting you sick. Another reason to avoid having anything to do with food that needs to be prepared on an op is the whole issue of pots, pans, cleaning dishes ect...

Camp food and the after-op feast, sure that ought to be prepared food, but not on the op. That is stuff for the retreat, cache, vehicle heavy baggage maybe, but not your go-pack.