A standout rocket , the Liquifly uses water pressure to launch a plastic soft drink bottle high, wide and spectacular .The kit supplies the necessary instructions and the valves , launching pad, and tubing. You supply the bottle (eg a coke bottle ) , some water to half-fill it, and a bike or foot pump to apply the pressure. Stand back when you launch - this thing really goes! (Directed Water pressure is a lot more powerful than the normal directed air pressure.) .