I have a Dremel hand tool and have used it on so much. They do make a glass cutting accessory, but I haven't used it. That big box store that sells Craftsman is a good place to start. I found a cute craft idea using mason jars, potpourri and battery operated lights down in the jar with the potpourri. I have seen these sold with a small hole drilled in the lid for the electric lights. Google cutting glass, Youtube videos and Pinterest as not all bottles are made the same. Good luck.
A diamond drill bit is the easiest and best. Also, you need water to keep any bit and the glass cool. Don't press too hard on the drill. Let the bit do the work. Too much pressure will cause the glass to break.