yeah man ok so firstly dude you need it to be air tight , im trying to hit what others have missed, any way hot glue is perfect for a soda bottle bong anyway put the carb hole near the bottom of the bottle, just like an inch above the water level hows that, or else if it as at the top it wont work as well........ok instructions to take a hit off it,,,first put your finger over the carb hole, then light your bud ...wait for the smoke to fill up the bottle, really it depends on how big a hit you take, and then take your finger off the carb,, if done properly smoke should shoot up into your lungs faster than a cheetah with the shits. enjoy sir and good luck to ya