– a clear jar – a balloon – 2 plastic bendy straws – water – food coloring (optional) – tape – scissors
Add a few drops of food coloring to a cup or so of water.
Cut the balloon where the neck starts to widen into the balloon.
Stretch the balloon over the mouth of the jar, you want it to be as flat as possible. Cut two tiny holes in the balloon, slightly smaller than your straw holes, about an inch apart.
Take the neck of the balloon and wrap it around the end of one straw. Tape it in place. It doesn’t have to be fancy just enough to prevent water and air from going into or out of that straw.