Making a glass from a bottle

[The Baker]

Hi,
I saw on the internet, drinking glasses that were cut down Bombay Sapphire bottles.
And I thought they were cool, maybe one day I might do that with different bottles.

So I looked up the process on the internet.
Turns out it was the same method my grandpa used in the early 1900's when Mum was a little girl.

The internet people wrapped string or preferably yarn (America speak for knitting wool?) a few times around the bottle in a line,
soaked the whole thing in acetone in order to thoroughly wet the yarn, set it afire then while it was hot plunged the bottle into iced water.
Then sanded the cut edges.

Our family were tee total but grandpa used the system to cut the tops off beer bottles (the big ones of the day, around 760 mils)
so as to keep them as a straight sided container for home made jam from the fruit trees in their orchard on the farm.
They needed lots of jam, there were 11 children in total.
They used paper stuck on with wheaten flour paste to seal the tops. The paper tightened as the paste dried.

They certainly had neither acetone nor ice so I believe grandpa used lighting kerosine
and plunged the bottles into ambient temperature water.

Has anyone done this and what did you use to soak the yarn?
Would alcohol burn hot enough?

Thanks,

Geoff