depends on your set up, but we did this and it worked amazing. the week before cook your meals, or mostly cook them that is. for instance you want to have walking tacos, cook and season all the meat the week prior, freeze it in some zip lock bags, because when you done you toss the bag in the garbage and dont have to clean another dish.
we have froze all kinds of things the week prior, takes less time to cook over a fire or coleman stove.
precooked maple flavored sausage links are the bomb also. lolololol
freeze as many bottles of water you can and keep them in the cooler also. freeze ice that you can drink later.