Other foods that have occurred to me that I have used for camp meals in the past few years:
Aldi’s has small plastic pouches of pre-cooked real bacon bits or chunks (larger bits) that don’t need to be refrigerated – mix with your eggs or add to sandwiches. And, as others have noted, you can keep eggs for several days (if you get fresh ones from the farmer’s market.)
Hard cheeses like aged cheddar and asiago or wax coated semi-soft cheeses like gouda and Bon Bel keep for days w/o refrigeration. So will summer sausage and dry salami (be sure to pre-slice before the trip or bring a sharp knife with you.)
Both Trader Joe’s and Aldi sell small round pita-like whole grain breads called “sandwich thins” that pack really well. They are split (like English muffins but much flatter) and the right size to fit in most camping frying pans – dump sliced sausage or salami plus cheese shavings, sun dried tomatoes and chopped red onion on the bread, top with balsamic glaze (available in a handy plastic squeeze bottle at Aldi’s) and heat it up over your camp stove with lid or foil over it until the cheese melts. The balsamic glaze is great on any vegetable as well. It’s easier to carry than balsamic vinegar because it’s thicker and won’t leak out of the bottle.
You can get both tomato and pesto sauce in plastic tubes in many grocery stores.