Bottle Cutter for $37.50 USA made version Wine Bottle cutter and beer bottle Glass cutting by GreenPowerScience
http://www.greenpowerscience.com/BOTTLECUTTING.php3
Bottle Cutting 101. This is the only bottler cutter that cuts bottles perfect every time. A flaming string is not good Terrible results. A blow torch is a BAD IDEA. Glass hammer will not work well.
This video uses a soldering iron for great edges on beer bottles
https://www.youtube.com/watch?v=vZEE3tyDdoo
I talked to a few people who have cut 1000's of bottles, they say "you cannot get a perfect cut, top will always be ruined" Not true. Perfect bottle cutting 95% of the time.
Glass Bottle Recycling. Reduce Reuse Recycle.
Make glasses from bottles.
Glass Bottleneck Guitar Slides.

DIY Bottleneck, Slide & Lap-Style guitarist.