My old housemates made a gravity bong out of a beer mug, the top of a little incense burner, and a Coke bottle. Fucked up my soldering iron putting a hole in the bottlecap though... damn stoners.
They cut the bottom of the bottle off and burnt a small hole in the cap. The part from the incense burner fits in the hole and holds the green. The beer mug is filled partway with water. With the cap off, stick the bottle in the mug and slide down till the opening is at the bottom of the mug. Put the cap with attachment back on, light, slowly pull up bottle until the bottom of the bottle is almost out of the water. You should seem some nice smoke inside the bottle now.
Remove cap, put you mouth around the mouth of bottle. Inhale while pushing the bottle down but be careful not to inhale any water.
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