Get yourself a 2 litre bottle.
take the lid off.
put a hole in the side big enough for water to rush out of.
Cover it with tape.
fill the bottle with water a quarter of the way (or a little less)
stick yourself some tin foil in the lid, making a bowl.
put yourself tiny holes in the top of the foil.
cut a hole in the lid for the bottle.
stick the lid back on the bottle.
Stick your Ganja in the top.
Get your buddy to light the ganja and you pull of the tape (or vise-versa).
Allow the water to poor out of the bottle via the hole you made.
watch your bottle fill with highness.
quickly cover the hole back with the tape when empty.
unscrew the lid, take the foil out, check for any unbearnt ganja, and breath in to your lungs on the lid.
there you have it. thats a bottle bong.
a more simple
one of these may be perhaps,
simply burning a hole
in the bottle big enough for the spliff, sticking the spliff
in the hole,
lighting it, and simply tootin on the bottle.