Photographing glass, bottles or anything semi-transparent is easy with the right set-up.
Home build rig designed to allow me to photograph a piece of glassware, a bottle, or even moldy bread with the option of lighting from below to highlight a bottle's contents, with some added light from above to fill in the details of the item, with the option of placing a strobe head behind the paper and having it light up the bottle from behind.
It's made from 1/2" PVC pipe, and a lot of T's and Elbows. I have a piece of glass as the top, and I use a roll of high end vellum as the sweep.
Here, I have one strobe head shooting upwards to light up the table with a soft box set as a fill.
The image below shows how this all comes together to make a beer bottle "glow" and create a decent gradient as the background. I added a piece of black cloth to avoid lens flare from the strobe aimed upwards.
