-= STEP 5 =- Fill bottle 1/4 of the way with water. Firmly push in stopper (with adapter fitted). /\ / \ / \ /______\ __| | | | | | | | |__|________| |___________| |___________| | | | |_/| || |\ / | || | \ / | || | \ /___|:::||:::|___\ |::::::::| \::::::/ ||__|| ||
Source: https://ascii.co.uk/art/rockets