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Heres a little nooby tutorial... Its a very useful throw away device. Maybe this could be stickied?

Supplies:

Plastic 20 oz bottle
Bowl (sprocket with screen inside it)
Lighter
Drill and bit (or if your in a pinch, a sharp knife)
Maybe some clay if your bowl isnt the best fit.

1. Drill a hole in your bottlecap, sized so that your bowl will fit.

2. In the middle of your bottle, or a little higher, drill a hole.

3. Now at the bottom, drill a hole on the tip of the curvy thing.



4. For the holes made in steps 2 and 3, put a flame to them, so the rough edges are smoothed out. When the plastic is sort of soft, press one of the sides of the lighter against it to have a nice contour. You dont want to hold the lighter so long that the plastic turns black, just until it gets a little soft.

5. Now put the bowl in the bottlecap. If the fit is a little rough then stick some clay around the edges so the fit is airtight.

6. Now to smoke... Pack the bowl, cover the carb, and put your mouth over the hole on the bottom that you made. Now light the bowl, and inhale slowly, and the bottle will fill with smoke. When you finish inhaling, uncover the carb and inhale a little harder. Repeat until bowl is finished, then pack another if you so desire. This is an easy and effective to make and use.
I'll try taking a picture of mine if some of you are confused. But for now:

Sorry for crappy ascii...

Another good way to make a bong like that.

Materials Needed:
500ml Coke Bottle
4" of Hosepipe
8mm Socket
Gauze(if needed)

Steps:

1. Use a lighter/knife to make a a rush-hole, near the top of the bottle.

2. Do the same on the opposite side of the bottle but lower down and big enough to fit a hosepipe through it, but not too big or it wont be airtight.

3. Push the 8mm socket into 1 end of the hosepipe, it should be a nice tight fit. If the hole at the bottom of ur socket is quite big use a gauze with a smaller hole pierced thru it to solve the problem.

4. Push the hosepipe into the hole you have made for it (non-socket end 1st).

5. Use insulation tape to make an airtight seal around the hosepipe (if needed).

This is the method i use to make a bong evrytime i need one, believe me it works great and gets you mashed.
Try it.