Sounds like they added something to your Methanol to prevent people drinking it.
For those that do not know:
Methanol = Alcohol, highly toxic to body in small amounts. Tastes and smells like Ethanol
Ethanol = Alcohol, toxic to body but in much larger amounts. Great source for fun, pleasure and gives you ' Beer Goggles" wich is a good thing!
Meths = Ethanol with added Methanol and agents that smell bad, taste bad and make you vomit
I think some "Meths" can be Methanol with " added ingredients", this depends on country.
Decades ago, I had an accident with Meths ( swedish T-sprit) the second day into a 3 week trek in the Swedish mountains. Tainted my cracker bread, coffee, flour, sugar and cooking utensils. It was disgusting, I still had to consume some of the food.
Clothes soaked but that was ok.
I had it in a Sigg 1 liter flask that cracked. After that I used the original plastic botles for years, with extra cut up bottle taped around it. No accidents.