Hey, fun to get this started! The ideas here are for car-camping, no fridge or freezer available, and not hiking where you pack in your food.
I make a batch of chilli and freeze it rock hard. It helps keep everything else cold (like steaks in a cooler for the first night) and then I thaw/cook it the third night. Same with hotdogs or bacon - I freeze what I can before and we eat it as it thaws, but keeps a long time in the cooler. Hard boiled eggs and cheese keep well and good for lunch. A batch of low carb “muffins” (basically ground flax, almond flour and eggs ) slice up to put nut butter on or cheese and pickles on when others have bread or crackers. Have a few fresh and a few frozen for later in the weekend.

Brazil nuts, pickles, pork rinds, olives, jerky all are good snacks.

Have fun!