Go to Wal-Mart and go to the card and party accesories isle. Find the little plastic stretch tubes that are about and inch and a half in diameter. They should stretch from about 6 inches to about 2 feet.
Cut a hole in a two liter bottle just big enouph for one of the tubes to fit completely through it. Put one of these tubes completely inside the bottle and use pliers to pull up the small end of the tube into the mouth of the bottle. One end of each tube is bigger than the other because they connect. It should be tight enouph to hold itself up.
Now insert just one end of the second tube into this same hole in the 2 liter and use duct tape to seal it in place. It takes some work but duct tape will seal it just fine.
Now you can either buy a water fall attachment for the bowl, but the cheapest route is to use tin foil to create a bowl on the mouth of the 2 liter and you take the hit from the second tube which should stick out up to almost 2 feet when fully stretched.
It works like a charm.
If you want bong rips for less, its the way to go.
