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I like to fool around in my garage, and make stuff. and one day I got the same idea you had. Glass is a very hard material to work with and I broke 2 bottles before I got one to work.
First thing is, sorry, but you're gonna have to pay up for a set of glass drill bits. They're not that expensive though. Make sure you get glass drill bits, not masonry ones.
When you drill glass, it REALLY helps to have a drill press. Getting the bit started in a hand drill is almost impossible. It can be done, but you have to be patient. When you drill glass, the workpiece MUST NOT be allowed to move, or it will break Hold it firmly somehow. When you are drilling, go very slowly, especially towards the end. If you press hard, the glass will crack. Let the drill do the work. If somehow your drilled hole is not big enough, you can enlarge it. To do this you should have a dremel tool with a CARBIDE grinding bit. Same rule as with the drill-let the tool do the work for you, and don't press hard.
There's a good chance you'll crack or break the glass. If you do, don't worry too much. If you only have one shard that cracked off while you were drilling, you can use model cement or superglue and glue it back. Be liberal with the glue, and don't touch the bottle until it's cured.
The last thing is that you have to wear safety goggles and a dust mask. You'll be amazed at the amount of dust one damn hole can make. I was stupid enough to not wear the mask the first time I tried this, and the dust got in my lungs. By the time I went to bed that night, I was coughing blood.
Hope that helps you.
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