you should just keep it a two piece bong, and while the waterfall bottle is not in use use a rubber stopper or a nail or something to plug the hole then for the bong bottle like glue a straw into it so when you take the rubber stopper off the waterfall bottle you can slide it onto the straw and the water will go through the straw into the other bottle. so like if your gonna pack a bowl you put the rubber stopper in and pack your bowl then you slide on straw and fill with water then it will flow throughand work as planned. sorry if this doesent make any sence as im high and im probably rambling on about nonsense.:stoned::stoned: