In this video tutorial, viewers learn how to a gravity bong. The materials required for this project are: a 5 gallon jug of water, knife, storage tube, socket wrench piece, water, herb and a lighter. Begin by cutting off the bottom part of the jug and use a knife to make a hole on the top of the cap. Then place the socket wrench piece into the cap and screw the cap back onto the jug. Now place the jug into a tub of water. Place the herbs into the bowl and then light it up. Take off the cap and inhale the smoke. This video will benefit hose viewers who enjoy doing drugs and smoking, and would like to learn how to make a homemade bong.