Ok well that will get you high and all BUT If your going to bother using it more than once build a better one. I have built damn near a hundred homemade bongs and pipes, out of everything imagineable to the point my freinds joke that im the bong macguyver, give me a stick of gum, a book, and paper clip I can make something. If you want to make a good simple homemade bong PLEASE PLEASE use decent materials.
Lets Start with the chamber, Any thick (rigid) food grade plastic (contained a bevrage at one time) bottle will work, IMO the short wide powerade containers are a good choice.Thin plastic waterbottles that crinckle if you squeze them are shit, dont even bother.
For the down stem you have a few options. I personaly think that for the down stem any type unvarnished/painted (on the inside) metal tube is fine, some people say that you should stay from aluminum as it might be harmful but i think that if properly made the tube will not heat enough to release (allgedly) harmfull fumes. I Discourage the use of plastics because they impart a bad taste and become quite stinky after a few uses, and can melt, burn and warp when smoking, and that is VERY bad for your health. My personal choice for downstem is clear vinyl tubing, its cheap, widely available, (IMO) safe and easy to mount the bowl on.
For the bowl I personaly keep it simple, using either air compressor fittings or sockets. Almost anything will work, as long as its not plastic or aluminum foil. For those who dont have a pack of screens, a the metal mesh from earbud style head phones works great, and who doesnt have a pair of broken head phones? Trim to fit with scissors and insert.
think you have everything you need? Not quite. You will need a lighter, hot glue and a drill if posible. Insert or attach the bowl to the downstem, the more air tight the better. Then position it so that the downstem is at a 45 degree angle to the side of the bottle about two thirds of the way down. The end of the downstem should be with in one inch of the bottom idealy, and the downstem and bowl should extend no more than two inches past the side of the bottle, cut to correct size if nessasary. Take your drill and put a hole about 3/4 the size of the downstem at a 45 degree angle about 2/3s the way down the bottle, if you dont have a drill ignore this step. Now use your lighter to either make or heat the the hole untill the plastic is soft now quickly insert the downstem and bowl at a 45 degree angle. Use hot glue to make air tight and you will have good bong for a long while.
bout to spark it up right now 
