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Where to Find the Rare Booze
If you ask yourself: Where to find the Rare Booze? So the answer is here!
It's in Old Town, which you're only able to visit late in the game once you've been there for Mika's events. So if you're not on Mika's route and it's not Chapter 5 or so, you can't do it yet.
The thing you'll be told to find then is in the Squad Six house's kitchen.