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Where exactly would you stay @detlev?
In my opinion, the best Croatian beers come from these breweries. They are available in most big shops.
https://zmajskapivovara.hr/pivo/stalna-ponuda/?lang=en
https://5th-element.com.hr/craft-piva/
https://pivovara-medvedgrad.hr/en/beer/
https://varionica.com/en/pivo/

By the way, I'm going to Croatia to the island of Pag tomorrow. I'll be there up to the end of July :)

I‘m mid south close to Mljet and Korcula

Oh, nice. Nearby is Lastovo, a unique national park. Both islands, Mljet and Korčula, are excellent. But I doubt you can find some of the beers I mentioned here. Probably only Ožujsko, a standard Croatian industrial lager :) But the wine should be great there!
Anyway, enjoy as you can :) 🍻😀

I do....