Hey Mallory and Mrs. Cheney, I found a great website that I got off NASA. It is titled All About Water Rockets. It sounds absolutely perfect for the project that we are doing if you want to check it out the URL is http://exploration.grc.nasa.gov/education/rocket/BottleRocket/about.htm
 (Mrs. Cheney please don't give this website to others. Not to be mean, but I want to win!)