Pótio iunípera. Literally junipery potion.
I’ve always been fascinated by how languages add new words to their lexicon. If you are as well, here’s a couple of links you may want to check out.
Oh, how do I know how to say “gin” in Latin? Years ago the Vatican City published a huge list of Latin neologisms. It’s in Italian, but if you install a browser extension that adds a dictionary (i.e. Google Dictionary) you will be able to double click the Italian word and see its English equivalent.