Ok for a water bottle bong... supplies: water bottle(anysize) A holwed out bic pen or somthing like that sort, a lighter, something for a bowl, if you want it buik and easy, tinfoil and some tape, anykind will do, but duct or electrical tape works best(this is for air tightness)... Burn a hole about the size of the pen, stick the pen at an angle, this is for the stem. now fashin a bowl out of the tinfoil... without filling it up cover all holes and blow in through the top of the water bottle to check for airtightness. If not totally airtight, put as much tape as you would like around the stem to make it air tight. Fill the bottle with water, but not too much. Fill bowl with marijuana, light, inhale, and enjoy!!