Make a launchpad that holds the bottle with the neck downwards, lets you attach the pump and stand behind the bottle. One good method is to plant a spade or garden fork in the ground at a low angle ...

It starts by tracing out a sine-wave-like pattern on the wall of the bottle. The staggered tongues that are left after cutting along this line make up the ... the body of the rocket.

Download the Water bottle ... The rocket launches with little or no warning and can fly in a random direction. Never fire it towards or over anyone. Before you start pumping, make sure the area ...