Jerky, yogurt, pudding cups, cheese, cereal, lunch meat, salad(vinegar & oil dressing), tuna in those little packets. How long did your ice last? Sometimes we would freeze water either in a 2 liter bottle or gallon milk jug and put in a cooler, this would last longer. You don't want to cook anything? If you have a campfire, you can bring those 'pie irons' and make things like grilled cheese, grilled pb&j, cinnamon rolls, pizza pockets. You could still cook over a campfire and still keep it to a minimum.