How to make a Gravity Bong!

Step 1: Materials		Materials needed: two-liter plastic bottle or water bottle (as shown), scissors, and a blow from a metal pipe.
Step 2: Cut it		Using the scissors, cut off the bottom of the bottle.
Step 3: Poke it		Poke a hole in the top of the lid or cap so that the bowl can be screwed in. Make sure that the bowl fits tightly.
Step 4: Thread it		Thread the bowl into the cap and place the cap back onto the bottle.
Step 5: Fill it		Put the bottle into a bucket of water (or a tub, pool, etc.). Hold the lighter to the bowl and pull up on the bottle to draw the smoke in.
Step 6: Suck it		Remove the cap and place your lips over the opening. Push the bottle into the water while inhaling.