FOOD FOOD FOOD!!! That'll get their attention. OK, the time limit will be a challenge but have your assistant at the same time take a small stove and boil up some water and add to an easy freezer bag recipe (say, instant stuffing and a foil chicken). Have each kid taste the results. Boil Water, wait five minutes, and eat with no dishes!! Quick, easy, and lightweight. (My son's patrol leader once had my son carry two (yes two) cases of cans of soda on a hike and camping trip. But then, at the time, my son was 6'2" 230 pounds and captain of the football team))