How we did it:
- plastic cups (2)
- bendy straw
Gather your materials!
Cut one of the plastic cups in half. Cut two small slits on the sides of the bottom half. This will be the plunger.
Use a pencil to poke a small hole in the bottom of the other cup.
Push the straw through the hole. Curve the bendy part up.
Press putty or clay around the straw to seal up the hole.
Hold your finger over the end of the straw and pour water into the cup
Angle the cup so that when you take your finger off the straw, no water comes out.
Hold the plunger by the bottom and quickly push it into the cup. As you push the plunger in, you'll see a squirt of water come out of the straw!
Tip: The cut slits in the plunger will help the cup flex as it goes inside the main cup. This will help the water squirt better!