Iceland was Christianized in 1000 CE. How did they get communion wine?

by oscarbelle

I was reading the very funny "A Short History Of Drunkeness," and it talks about the importance of Christianity in spreading a preference for grape wine specifically to a lot of places that grapes aren't native. The book has a throwaway line about Iceland being particularly difficult to spread grapes to, and now I'm curious. Iceland has an awful climate for grapes. As far as I can tell from doing a bit of googling, no one grows grapes at all in modern Iceland. Did they import all the wine? What did they do? The only Church that existed at the time was the Catholic church, and the Catholics are very insistent that it must be grape juice, and it must be fermented to count. So... how did this work?

While more can always be said, I posted an answer to the similar question to OP before in: How did traditional Christianities that believe in transubstantiation manage expansion into places where wheat and/or grapes do not grow?

Imported grape wine: at least available in Bergen, western Norway, by 1200.
Substitute #01, berry wine (I cite some accounts in: Modern Iceland is self-sufficient in dairy, meat, and eggs, but imports the vast majority of its other food, since the land is mostly not suitable for farming. Was the local diet mostly animal-based in the Viking age? What else were they eating?)
Substitute #02, wine (juice?) made of dried grape (mentioned also in the linked post): Mentioned by the letter of Norwegian bishop in the beginning of the 14th century, addressed to his colleague in Greenland

Archaeologists have also recently identified a grape seed from a few archaeological sites in Denmark (the oldest seems to be from the late Bronze Age! - see the news article in English here), but it is not so likely that possible "indigenous" product of grape wine could largely make up for the demand for Christian ritual use, even in southern Scandinavia.

Add. Reference:

Peter Steen Henriksen, Sandie Holst & Karin Margarita Frei. "Iron and Viking Age grapes from Denmark – vine seeds found at the royal complexes by Lake Tissø." Danish Journal of Archaeology 6 (2017). http://dx.doi.org/10.1080/21662282.2017.1293397 (doi link is now unfortunately down when I check).