• Baking soda

• White vinegar

• Plastic bottles

• Straws

• Markers (optional) for decorating the boat

• Hot glue (not pictured)

• Baby pool or bathtub (not pictured)

Step 1: Decorate your “boat.”

Take the labels off the plastic bottles and decorate the “boat” using permanent or (oil-based) paint markers. 

Step 2: Drill a hole in the bottom of the boat—then put a straw in it.

Using a drill or soldering tool, make a small hole (the size of a straw circumference) in the bottom edge of your plastic bottle.

Place a three or four-inch straw into the hole so that about an inch of sticks into the bottle and the rest sticks out the back). To secure the straw so that no liquid drips out the sides, apply hot glue around the edges.

Step 3: Fill it up and watch it go!

Turn the bottle sideways, and cover the straw end with your fingertip while you pour about 1 cup of vinegar into the bottle. Then, keeping the bottle flat and the straw side up (so nothing spills out), drop a few spoonfuls of baking soda into the bottle. Make sure to keep the baking soda on one end and the vinegar on the other.

Give the bottle one quick shake, and place it quickly into your pool or tub. And it’s off!