Take a 20 liter plastic water cooler jug. Drill four 3/8" holes around to the top, put in four 3/8" hoses a couple feet long and seal them. These are your mouthpieces. Then find a bowl. For the bowl on mine, I use one of those large spark plug sockets. Drill a hole in the lid of the bottle and insert the bowl. Seal it with silicone or something similarly heat-resistant. Then, on the bottom of the cap, fix a rubber hose that reaches to the bottom of the jug over the bottom of the bowl and seal it in place. This is your main bowl and hose. Fill the bong half-full of water and put the lid on the top. You now have a bong with a 10 liter chamber and a bowl that can hold as much as an eighth of an ounce (or more) that four people can suck on at once. A propane torch or similar heavy-duty flame is recommended for lighting the bowl, as the bowl should be WAY too big for a lighter flame. Any hoses that aren't being used to toke should be plugged (as well, cover the end with your thumb while exhaling or resting) or there won't be any suction. Or unplug a couple hoses and they'll serve as a carb to drain the chamber. A waterfall adjustment can also be made by putting some kind of removable cap on the bottom and making the bowl hose removable. The ultimate party bong