lmao thats the most ghetto shit ive ever heard. heres what you do. Get a water bottle and a container that the bottle will fit in. Burn a hole in the cap of the water bottle and stick in a ratchet (or tin foil if you dont have 1) to put the weed in. then burn 1 hole in the bottom corner of the water bottle. OK so now your "pisser" or "gravity bong" is complete. fill the container with water and put the water bottle in it til it sinks to the bottom (you can suck on the water bottle top to make it go faster). pack your bowl and light you lighter over the weed and pull up on the water bottle, if you did it right then the smoke will be flowing into the water bottle
I don't really make homemade pieces and would usually answer somewhat like the blade above but my suggestion would be to buy a gong diffuser and gong bowl and use that in your homemade pieces instead of a pen and tin foil. Shouldn't cost more than $25-35, even cheaper depending on your LHS, and it'll provide a much better smoking experience...well as good as a homemade gets.