By Dianne from Wooster, OH
It's not easy! You need a special drill bit. You can sometimes use the one made for drilling ceramics but a diamond bit works much better. & while you're drilling you need to have someone drip water on the bit & the area being drilled. This prevents heat build-up. At least this is how a friend told me she drilled a sheet of glass which is basically the same thing (but not as thick as a pop bottle.
Check this out:
They sell flat nose diamond bits & also have a "how to" section.
I do drill wine bottles with a drill press. This helps because you can exert even pressure. First fill the bottle with cool water all the way to the top and cork it. I use a vacuum sealing cork. Then use some plumbers putty to create a dam at the drill site and fill that with water. All this is to keep the glass cool. Drill away. The tricky part is at the very end, you don't want to put to much force because it can still splinter.
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Anyone know how to drill a hole in the side of a wine bottle without it cracking. I make glass blocks as well, but I don't think drilling will work as glass is thin.