Preparing for my workshop this week (Intro to the Professional Studio). We will split a bottle in half to use in the shoot. I was going to cut the glass (problematic) until I found this YouTube video showing how you can split a bottle in half by soaking a string in acetone, wrapping the bottle with it, lighting it on fire, then dunking it in ice water.
I got it to work! It took a few tries (and a few failures), and its not clean, but it will work.
We are going to do it in class on Wed, should be fun: