well sid, for one thats called a gravity bong...a water fall is a bottle with a bowl on top, you cut a small hole in the bottom, fill up the bottle with water, light bowl/or tin foil in your case haha, let finger off hole let water strain out while lighting.

haha, but the way, on your "watefall", you should be getter biggier hits then you did. and your supposed to push the bottle down through the water, so the smoke forces its way into your lungs

you clown