The program had two families who had to make a beer cooler and a vegetable thrower out of items contained in there house.
One family took out their central heating pipework and coiled it round two cans, They then used a gas bottle connected one end and the expanding gas cooled the cans down to 11C. The gas was burnt off at the other end.
Although this shows potential, its the thought of the billowing flame in your campsite that puts me off. You could is suppose have the gas powering the barbe, but you would have to have hell of alot of gas for all those days of drinking.
The other family also took the central heating pipes out but coiled them down from a funnel, wrapped them in cloth, placed a fan underneath. They wet the cloth switched the fan on and poured the beer in, Cooled it to 7C, but looked fizzy!
Can't see that one working on the campsite. Have to be careful no one pees in it when your not there.