This water rocket launcher lets you do just that ... If you’ve already got a compressor and some empty 2-liter bottles you might also pick up some extra PVC to make this pressurized water ...

Indeed, we’re mighty impressed by the completeness of the build, which was intended to create a station for charging and launching air-powered water rockets ... the necks of 2-liter soda ...

While prototypes of water-powered rocket thrusters and engines have been developed before, and a few have succeeded in launching CubeSats, water has not yet been used as a propellant on a large scale.