If you have it, you can use a socket from a your (or your dad's) tools. (It's a metal cyclinder shape with a hole thru the middle basically) Then unscrew the faucet and take the part that comes off apart until you find a screen. Take that and put in the socket. There's your bowl.. For the stem, you can use whatever fits... If you have a small metal flashlight (maglight), you can take the top part off and find a screen and use that too, but it's kind of a big bowl. Then you can empty and bust out the rest in the bottom and use that for the stem. I did this with a rainbow colored flashlight to use in a bong.. It was pretty cool and works really well. Well, that's all I can really think of at the moment... Hope it helped!
Soda/Pop (for your funny people)/Beer Can Aluminum Foil An Apple or what i did the shit youll need is a pair of scissor, duct tape (or any strong tape really), a "take apart pen" and a 20 oz soda bottle. i took a 20oz mountain dew bottle, a pen tube, duct tape, and a metal cap to a fifth of bacardi superior...pushed in the top of the bacardi cap with my thumb, >>removed the rubber piece from the inside of the cap<<, and then poked some holes in it...This goes where the normal soda cap would be, and holds your weed. So put this on there (its not gonna be snug) and wrap some duct tape round that sum-bitch. Then, somewhere in the middle, you cut a line horizontal, and a line vertical, and put in the pen tube (empty out all the ink filler and shit like that, and cut about 1/4 of it off. then slip it through the hole) i then put some duct tape around the pen tube so it would pull, and then cut a shotgun near the bottom of the bottle.. I dubbed it "The Green Monster" (GO RED SOX)
ive got over the whole 'dont use aluminium' caus in the end, i mean if you smoke so much that it will do you damage, chances are youve had the bright idea to go buy a bowl for like 5 bucks? anyway, get an aluminium can, cut a circle out of it, and turn it into a cone-shape. cut off the bottom, and there you have it.
My favorite is always the good old tin foil. Wrap it around a thick highlighter or pen or something and then just slide off the foil. Use another piece of tin foil to form the actual bowl part, poke a hole and youve got yourself a great makeshift bowl!
I was gonna suggest that too. But first, as a better bowl, I was going to suggest what the other guy said, using a socket from a socket wrench set. I use them all the time on my homemades and they work great. It's better than pop can bowls because it's made of stainless steel. Aluminum isn't supposed to be good for you to smoke from.
dont make a bowl, make a steam roller! take an empty paper-towel roll (or a toilet paper roll) and make a hole in the middle of it with a knife. Then rip off an inch and a half to two inches of aluminum foil, and mold it around your finger. Then take ure finger and put it in the hole about a quarter inch in, and fold then fold down the parts stickin up so its molded flat around the hole. Then take a cork screw, and poke a small hole in the middle of the bowl part. This works sooo well, and will make a small bowl of weed get u sooo stoned!
My favorite home made piece is a good old apple. Just put a hole on top for the bowl, a hole on the side to suck, and one more hole if you want a carb. Clean and simple.