Cut a rectangle of paper (~ 2"x8"). Put paper in ziplock, fold over & tape (to make sail water tight). Poke a pen through sail. Tape pen & Chapstick to Tupperware boat (Chapstick= counterweight).
Here are our two boats.
Feel free to add balls of paper for "cannon balls". :)
Grab two bendy straws
And two 8x10 baking dishes. Fill both baking dishes about halfway with water. Note: you can grab capped-off rain gutters or use the bath tub if your kids are older.
Set baking dishes full of water on floor. If inside, put a towel down first. Place boats in the water. Use bendy straw to blow into sails!
On your marks, get set, GO! Whoever makes it across the pan first wins!