Surgical alcohol is pure alcohol with no additives, distilled from fermented sugars. It is not isopropyl and not methylated or wood alcohol nor is it rubbing alcohol. Yes it can be drunk, although I shudder to think of the taste and effect of 95 per cent pure alcohol!

Failing finding pure alcohol sometime ago I have mashed alkanet in vodka, and it worked.

Methylated alcohol will leave that grey or brown stain on wood and leather.