Interporting and wine

[smplybcause]

So I'm looking at a cruise that interports - has boarding in both Rome & Barcelona. And I was just curious if anyone that knows how that works with regard to bringing wine on board. Since people are embarking at both ports bringing on their allowed 2 bottles - is there something so non-embarking aren't bringing on wine on those ports? I'm guessing there's probably something in place, but figured I'd ask. 

[little britain]

There is a good wine shop after security in Barcelona ….. wink 😉 . Get on and off the ship as many times as you want.