Here is another simple kit that comes with everything you need to build your own water bottle launcher. This Soda Bottle Water Rocket Launcher can launch bottles over 250 feet. You can always modify your bottles to go higher.
More gadgets like this: here
You will need about 15 minutes to assemble this. This launcher supports up to 125 PSI pressure. It can work with 1 to 2L plastic water bottles.
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