ok, I'll make a tutorial right here if it might help (this is how I did it, if I'm wrong anywhere, tell me)

1) buy sobe and drink delicious nectar of the gods
2) clean bottle (can be done at any time really)
3) take a hammer and a screw driver (phillips is my preference) or a nail. put the tip of the nail or screw driver against the top left edge of the little thin place on the bottom edge of the bottle.
4) CAREFULLY tap the screw driver with the hammer until it breaks through. Try to keep the angle of attack in the thinest part (near the top left corner) if successful, it should be a small hole. now carefully widen it by making soft, swift strokes that connect barely with the edge of the hole. widen to desired water drain speed and strength (I widen it till the whole notch is gone and slowly pull it)
5) if you are this far, take a moment to have some goodole fashion vain backpatting, because the hardish stuff is over
6) now take a knife or drill, and drill a hole in the cap so that your bowl fits snug (VERY snug). I use smallish wrench head (see photo)
7) load bowl with some dankity dank chronic (or w/e, dankness is your choice)
8) fill bottle while covering the hole so no water leaks
9) screw the loaded bowl/cap onto the bottle
10) hold the lighter over the bowl and let go of the hole. This should fill the bottle with smoke instead of water (that wasn't water in his pic, that was delicious smoke (nice milkshot btw))
11) unscrew bowl and inhale intoxicating gas
12) repeat until baked to a crisp

FORGIVE ME my photos are shitty, I need a real camera

I found this little plastic thing that works as a nice water tank