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Use a liter bottle. Slide the rocket onto the launcher. Stomp to launch.

Article:
Get your empty, plastic two liter bottle and ½ inch diameter, foot long PVC. Slide the PVC into the bottle. It will fit nice and snug. When you are ready to fire your rocket, head outside as these can sometimes travel up to 100 yards. Squeeze the plastic bottle as hard as you can to shoot the rocket into the air or at a distant target. Make sure the people around you know you’re about to fire. Pace the plastic bottle on the ground. With the rocket attached to the PVC, stomp on the middle of the bottle as hard as you can and watch the rocket fly. Make sure the people around you know you’re about to fire so you don't hit them.