Salad stuff should last a couple of days out of the fridge if you keep in a water-tight container.
What about soup?
Dried fruit? Fresh fruit - I love oranges when camping.
Omelette? (If you've gota frypan and a stove the world is your oyster )
If you go camping a lot, promise yourself that one day you'll treat yourselves to a fridge! You'll never look back
Have fun!