a jar of peanut butter with granola and dried fruit and candy mixed in is a solid go to.

granola bars in general are solid, even the ones you make yourself.

fresh fruit like apples and bananas are good.

canned condensed soups are surprisingly good cold if you have access to fresh water to reconstitute them and you aren't worried about dehydration. that brings me to my next and much, much more important question:

do you have water figured out?

you can easily survive for four days without food, but you can't make it that long without water. you can't expect to rely on springs/streams/wells especially if you haven't been drinking from them for a while already.

you need about a gallon of water a day, more if youre exerting yourself, sick or eating very dry foods (like camping foods). so if you don't have a supply already figured out, focus on water. If you do have a supply already figured out, pack a gallon or so and some iodine anyway. you literally can't survive if for whatever reason the supply that was fine last time isn't running or is spoiled.

if you do end up having access to water, you can use flameless ration heaters to boil it quickly and use that to heat up any sealed foods you have. frhs' are powdered metals and salt that make a real hot reaction when you pour water on em. so if you had a bag with a frh in it, you had say some food that would taste good hot in another sealed bag, you could put your food bag in the frh bag and pour some water in, fold it closed, prop it up on a rock or something and wait for your food to get hot.