2 large buckets (trash can size) per team.
1 bucket w/ holes per team.
Form teams of about 6-10 people. Fill 1 of the large buckets full of water. Place the bucket full of water and the empty bucket about 10-20 feet apart (depending on how many people you have per team). Each team lines up in between the buckets. The objective is to dip the bucket full of holes in the bucket full of water and you pass it between the members and dump the remaining water into the empty bucket. In a specified amount of time (like 1-2 minutes) the team w/ the most amount of water in their bucket (the one that was empty to begin with) wins. Best to make sure campers where colored clothing for this event, they will get soaked.