Instructions
Stretch the water balloon's neck over a faucet.
Turn the faucet on and hold the balloon's neck in place to prevent it from slipping off the faucet. Fill the balloon up to the neck so it is stretched out but not stressed. It should look like a round sphere or oval, not a pear.
Remove the balloon from the faucet and wrap the neck around two of your fingers to make a loop.
Thread the end of the neck through the loop and pull tight. Your water balloon is now tied.