Looking for something exciting to do? Try building a water powered rocket out of a 2 liter soda bottle! This can be completed in less than half an hour with simple household materials.
Take a cork and stick it into the soda bottle's opening to make sure that it fits in snugly. The seal has to be tight, so if your cork doesn't fit either find a larger diameter cork, or wrap the cork with tape to increase the diameter.
Cut the cork shorter so that the Schrader needle is longer than the cork, the tip of the Schrader needle has an opening that needs to be exposed.