[fensterblick]

That doesn't sound normal. Many alcohol stills use copper (wikipedia has this bit of information: "(a copper still) removes sulfur-based compounds from the alcohol that would make it unpleasant to drink")

[samstave]

Yeah, that's why I'm scared of it now... any clue how I could test it?

[thatcat]

What are the sides sealed with? Alcohol is a good solvent so it may be an adhesive flavor youve tasted.

You could check the density if you think its not actually copper material though.

[peterwwillis]

There are copper testing kits for aquarium water, but your health isn't really worth risking with a $10 aquarium test. Throw it away and buy a new one, and research how to properly handle copper cookware.