Basically the same as what time is it Mr.Wolf, but with a hose. The person who is "It" has the hose, with the help of a counselor. The campers say what time is it blue whale until they reach the IT person. Then the IT person says "spray time!" Whoever they soak is now it.
NOTE - the IT person must spray below the waist because water in the face hurts.
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Requirements
Large Field, a hose, and kids wanting to get soaked.