Look at the NASA website.
http://exploration.grc.nasa.gov/education/rocket/BottleRocket/about.htm
A Search of water bottle rockets will give you plenty of info and ideas. At a minimum you need a bottle, fins and nose cone after that you can get as fancy as you like. A few things to note: a. our launcher will not accept nozzles; b. using glue to attach things to the bottle may weaken it and cause it to explode; c. If the nose cone is made of hard materials, it should not be pointed for safety reasons; d. having a payload or parachute will add weight and take altitude off the flight (but may add fun).
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