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A Garbage bag or plastic bag (for the parachute)
Duct tape
scissors
Cardboard or foam core
A Tennis ball
Dental floss or string
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if your talking about the liquid inside it has to be water not SODA.
We have a sudden rash of water-rockets. I'm guessing it's a school project?
Have you all seen the relevant groups:
http://www.instructables.com/group/H2Orocketables/
http://www.instructables.com/group/rockets/