I know this question has been answered before but for some reason the search engine for this site isn't working, so please bear with me.

I've found six bottles of the Shadowbanish Wine and got the "A Venerable Vintage" quest. Where do I go to turn these in? Searched just about everywhere.

If you scroll through your active quest list it tells you the person and the Inn they own and if you make it current quest it places a map marker.
Its an inn outside a town cant remember what one off hand.

I had the same problem, got the answer here though, it's Waynett Inn or something, just west outside the gate of Imperial City next to Weye. The innkeeper wants the bottles.