@Lola -- thank you for that information and tips.
Based on you and Chris' answers, if I buy any wine in Europe, maybe I'll just enjoy it there and not worry about the hassle of getting it back.
I'm considering the Adriatic tour, so I'm sure, however, there will be olive oils, truffled items, etc., I'd love to bring back to enjoy or cook with.
I believe the "liquids" issue is only in carry-on luggage. I remember that on my last trip, my wife and I got a small bottle of schnapps from Salzburg, but it was easy to properly pack in checked luggage, so it was no issue.
I forget, do all food items (alcohol, too?) need to be declared regardless of in checked or carry-on bags? Also, it's declared upon entry back to the US, right? (Sorry, I always get confused in this area)