In this tutorial, we learn how to make a waterfall bong. To start, take an empty 2 liter bottle and cute a rectangle into the bottom 1/3 of it. Next, scrunch up a piece of foil and push it into the top of the bottle. Pierce holes in the bottom of the foil, this is where you will next place what you are smoking inside of it. After this, pour water into the bottle to fill it all the way up and place it onto a counter by a sink. Next, light up your bong and the bottle will now smoke. Once the smoke is gone you're finished, enjoy!