Four pans of water
Not a lot
Pick three people out of the audience and get them to pretend that one is the pilot one is the navigator and one is the rear gunner of a Lancaster Bomber. Then you need four more volunteers to be the engines. They are flying back from a bombing raid when the enemy fire hits one of the engines, so the scout who is that engine falls over. It goes on until all the engines have fallen over. Now tell the audience that the engines have caught fire. Now shout "WHATS THE BEST WAY TO PUT OUT FIRE" and four scouts run in with the four pans of water and drench the scouts who are the engines while shouting "WATER!".
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