cut the bottom out of a two liter bottle, unscrew the cap and make a bowl/slide out of aluminum foil.  put a little bit of bud in (1/4-1/2 gram).  Put the cut part of the bottle into a deep contaner of water and spark the bowl.  As you spark the bowl, pull up on the bottle and the pressure differential will pull the smoke down into the bottle.  (pull slower than you think you should.  When the bottle is fullof smoke, pull out the slide and inhale as you push the bottle back into the water.  This is called a gravity bong and it will get you ripped.  I know it sounds complicated but once you get used to it its pretty easy.