Either way, all it is, there's a notch at the bottom of the Sobe bottle. You put a pointed object, pointing in, on the notch and hit it with a hammer of sorts. I use a somewhat thick nail, but I have seen a pen used. You hit it once hard enough and bam you got a hole. . . then just punch a dent and some holes in the top and you in. . . pack it up and go. . .

I'll try to remember to take some pics next time I make one. . .