They have glass drill bits at places like Lowes or maybe ur Wal-Mart. They look kinda like spades(from a deck of cards). If ur glass is thick enough, it won't break. I used a 750 mL bottle of Goldschlager and drilled right thru the gold coin on the bottle. It took me about 20 minutes of drilling and works beautifully.

BUY A GLASS BOWL AND DOWNSTEM, and use candle-wax to fix leaks.