To make a waterfall bong you need 1 2 liter bottle, a knife, a drill, rubber stopper, 1/4th inch threaded copper tubing and a threaded aluminum bowl. Cut a ½ inch hole with the knife into the side of the bottle at its bottom. Drill a hole through the center of the rubber stopper and then slide through the copper tube into it. Twist on the aluminum bowl to the copper tube. Put your finger at the bottom hole and fill it completely with water. The rubber contraption has to be placed on the bottle mouth and has to be light up. Release the finger from the bottom and keep the lighter going. Just take topper out and inhale the smoke after this.