Ok, here i plan to put how to build shit, designed and tested by me, or others.
--1 marker cap
--1 bowl(The best thing to use is one of those salt shaker caps that taper off to a point, they can be really packed and allow enormous hits)
--1 lighter or similar device
--some duct tape
--some tinfoil
--1 sharp object(tack, etc.)
Alright, now to start off you gotta get a bowl. one great thing to use is a salt shaker cap. If u can get one thats sort of a cone that makes a point on the top if its on the shaker then thats great. Put some tinfoil around it(to make sure the cap doesn't melt as you toke, lol). Then, proceed to hear the cap with the lighter(or whatever) about 1cm from the end opposite the opening the marker goes in. Once u have it soft enough to push the cap through, then DO THAT FOR GODS SAKE. After that, you must test it to see if it's truly airtight(for maximum tokeage). If it leaks a bit, just put plasticine around the bowl to seal it off. Then proceed to duct tape the bowl onto the marker cap being careful not to cover the opening (duh). And you're done! maximum concealability.
--1 water bottle(Dasani, evian, etc.(or even a coke bottle or whatever))
--1 piece of siphon hose
--1 lighter/whatever
--1 pair of scissors
--1 tin can
--Some plasticine
Ok, u start off by burning a hole in the middle of the bottle barely big enough for the hose to fit in. Then, you poke a smaller hole in the other side, maybe half as big as a dime. Anyways, you then take the can and cut out a piece of it that's about 2 inches wide and looks like This. Anyways, you then fold that into a cone, and cut off the sharp tip so it's got a hole in the end for the smoke to escape. Now, you have to force the cone into the end of the siphon hose. If it keeps falling out, then just melt the hose a bit and push the cone in further. Make sure it's airtight around the cone!!! this is very important!! Now, stick that siphon hose through the siphon hose-sized opening on the water bottle so that the part of the hose inside the bottle touches the bottom of the bottle. Make sure the connection is sealed by again using plasticine around the opening.
Fill it with water, but not above the smaller hole, as it will spill out. You fill the cone with somewhat mashed weed, but not mashed enough to fall through the opening. You then light that, and covering the smaller hole(let's call it a carb) with ur thumb, you would suck on the bottle's opening, the one where the cap goes. When you feel the smoke entering ur lungs, you take ur thumb off the carb. Then you will get SO much more smoke in ur lungs itll probly be a rush. After u take ur thumb off the carb, just keep sucking the same strength. Enjoy, pothead. By the way, that was a beginner bong, and it takes like 15 minutes to make. Fun and E-z!