I was just in Copenhagen a couple of weeks ago and one of my takeaways was that Copenhagen is a somewhat expensive city. There were some nice duty free stores in the Airport (not sure if you can buy stuff on arrival from the US...maybe but not sure) but even there, duty free prices for liquor were significantly higher than they were in Prague. You shouldn't have any issue with "finding" a civilian liquor store in Copenhagen, however while I didn't go into one, I suspect won't be happy with the prices there. I would pack a couple of bottles into your checked luggage from Florida, OR visit the duty free in the US to stock up and carry it onto the plane. With the new packaging at the Duty Free stores, there generally isn't an issue with either carrying it onto the plane, or carrying it through a subsequent security checkpoint AS LONG AS YOU HAVEN'T OPENED IT. The security people in Europe (if you go through another security line...which I had to do on arrival from Los Angeles for a plane change in Oslo) may reopen the bag to look at the bottle and check the receipt, but they will securely seal it again and give it back to you as long as the receipt is in there, and you haven't opened the secure bag. Its the only large volume of liquid you will be allowed to carry through any security line.