Single/multi-choice problem: Which of the following solutions is better for the following goal:
how to cut bottles for drinkware

pick from the following.
- soak a piece of string in alcohol. wrap around the bottle at desired height and tie. Light string on fire, and allow to burn for a bit, before dipping in cold water. firmly tap against a stiff surface. sand edges with a light sandpaper.
- soak a piece of string in activated charcoal. wrap around the bottle at desired height and tie. Light string on fire, and allow to burn for a bit, before dipping in cold water. firmly tap against a stiff surface. sand edges with a light sandpaper.
soak a piece of string in alcohol. wrap around the bottle at desired height and tie. Light string on fire, and allow to burn for a bit, before dipping in cold water. firmly tap against a stiff surface. sand edges with a light sandpaper