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To make a waterfall bong, all you'll need is a 1-liter plastic bottle and a 1/4-inch socket for a socket wrench. First, poke a 1/4-inch hole in the cap with a knife or a sharp pen. Then, place the socket inside the hole. Finally, just cut a 1/4-inch hole about 5 inches up from the bottom of the bottle for the carb, which is the hole you'll hold shut with your finger when you smoke the bong. Once your bong is ready to go, fill the socket in the cap with your smoking material. Then, fill the bottle with water while keeping the carb covered. Do this outside or over a sink since water is going to pour out. Take your finger off the carb and light the material in the socket. As the water drains out, the bottle will fill up with smoke. Once the water stops draining, take off the lid and inhale. For more tips, including how to make your own percolator for your waterfall bong, read on!