Wear a dust mask, cause' glass powder isn't good for the lungs. Eye protection is always a good shot too!
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Signing UpStep 1: Pick a Bottle
Check this size bit. I choose this shape to go in at a slight angle so it is more like you are digging out the glass
rather than wildly spinning through it like on a drill press or the like.








































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The diamond tool is just one method. Most hardware store sell a glass bit for a drill. I've used it with acceptable results. The method being shown here look much better and I bet the tool could be used to engrave the glass later.
I also thought of decorating the bottle with glass decals, better yet, maybe some glass etching designs using etching paste.
The diamond bit makes all the difference. I just made 2 of these in less than 10 minutes.
Remember: rotary tools work on speed, *not* power. Don't try adding too much pressure to the bottle, and make sure your bit doesn't stray and you'll have a perfect hole when you're done - instead of scratch marks and dents like mine.
Excellent Instructable.