this is fun to do when bored it works and it looks cool too!.... How to make a bottle bong!!....i remember when i made my first one all my friends begged me to make them ones too lol.. ALRIGHT Get a plastic soda bottle depending on how large you want your bong you can use anything from a small soda bottle to a 2 liter one you will need to have a bong stem or you can make your own using a metal pipe, a hollowed out pen tube, or a glass or hard plastic straw next attach a bowl to the top of it with duct tape or electrical tape (if needed).. you can buy a glass bowl from a head shop cheap or you can make your own out of tin foil or something the shape of a bowl (wrench socket etc) you can find in your home..personally i used a wooden pipe bowl.. (also i dont recommend using tin foil unless you really have too.. Take the bottle and cut out a round hole that is the same size as your stem About 2 inches from the bottom This hole is where the smoke will enter the bong from your bowl, next make a smaller hole one inch above that one (that will be your clearing hole) Place the stem inside the hole make sure its airtight else this wont work you can test it by covering up the clearing hole and blowing into the mouth piece and feeling with your fingers for any air that may come out around the stems hole if you feel air then use tape to cover the spots the air is coming out of. this is what your finished project should look like http://weedsmokersguide.com/pictures/Homemade-Bottle-Bong-300x225.jpg alright now put enough water in the bottle so that the stem is under water dont put too much though else you wont feel the effects as good cause there wont be as much smoke.. next apply weed to the bowl that you have chosen light it up! cover up the clearing hole with one finger,suck from the top of the bottle and enjoy!