Hi Christina!
Thank you for commenting.
This is eight shots merged. The bubbles were not shot individually. I took what I thought was the best of what I shot, looking at the placement of the bubbles in relation to the glasses/bottle and used those. The individual shots look the same just without as many bubbles.
They are just like shooting transparent glass spheres and the same techniques can be used. Probably the color on the BG helps with the streaking. Another thing that helps is using flash. That stops any movement in the bubble solution as it moves with the bubbles and I can shoot at max sync, which without any lights fired, gives a black frame. Since the only light in the scene is coming off the background straight into the camera, and nothing is very close by, I also get no reflections from anything in the room. You only get the black outline and the color just like the glasses.
If your interested I did
this same set-up but added another accent light, for a little different look! This light did add some reflection.