I really want to try this as well, I just had the idea of getting my friends bong slide and buying a glass drill bit to match the diameter of the slide. I hear some people saying you cant drill it at an angle, is this true? is there no way you can drill at an angle?

I was thinking of getting a Sobe bottle for it, the bottles are a nice size and they have little lizards carved in the glass around the top. If i could do this several times I could make one out of each type, because they all have wierd names, like Lizard Fuel and Tsunami and Liz Blizz lol.

Here is the one i wanted to use:
http://www.cool-drinks.com/Images/SoBeLizardFuel.gif