check out my home made water bong made out of a drinking cup and the top of a 2 liter.
the next one is my pipe, the top bowl is gone to make the bowl of the bong lol.
the stem of my bong is a straw from mcdonalds wrapped with duct tape. i also duct taped some tin foil on to the bowl since i have no screens. the stem is sealed with some bubble gum. its all air tight too.