Another idea I got browsing Pinterest. You can view the post I saw HERE. First, we taped bendy straws to the bottom of the cups. We froze water in those little fruit cup containers and added a couple drops of color....just for fun. I then cut out the sails and punched holes in them. When the boats were completely frozen, we slipped on the sail and set sail in our water table. Too fun and perfect for a warmer day.