Rapunzel and Alice
Alice was in a sundress with her bathing suit under. She had this nifty towel thingy, it was like... a towel that wraps up and has straps to make a backpack? Awesome. She didn't have to carry around a towel, she just slung it on her back. There was even a pocket for her cell phone and keys! Left her hands free for SQUIRT GUN DOMINATION.
She was running around at the beach party, having discarded her shoes by the table where the pregnant lady was selling stuff, and was dousing whoever she could get with her gun, finding she was getting pretty soaked herself! That when she she heard the war-cry, and threw her hands up over her head.
But it was too late. She had to run to the water to refill... she'd have her revenge!