Waking up WeT & CoNfUsEd...=b?

I am getting payback on my little sister... @ 3AM im gonna soak her wih really cold water... BUT THERES A BIG PROBLEM!!! my brother threw out his water gun and all our baloons r gone... i dont wanna use a bucket or anything... how can i d this???? any other payback ideas would be awesome... mmmmmwwwwwwaaaaaaaaaahhhhhhhhh!!! =D