i would personally adivse the gravity bong like the person said before because ull be completely retarded after a few lol but or you could get a gallon jug cut a hole about 2 inches from the bottom of it " this will be were you inhale the lovely smoke" then cut a hole in the cap and put tin foil in it the shape of a bowl.... make a carb close to around the top ..then inhale till its full of smoke and clear that bitch...works pretty damn good......