Marayn Voldal of the Howling Hound in Vhul has a generic 'food' dialogue option (likely for all publicians) that lists what beverages the pub has to sell. Unfortunately, this list does not match the barter inventory.

"I've got the good stuff, too, behind the counter -- Cyrodiilic brandy and flin -- but it ain't cheap." - except he doesn't sell either. He lists all of greef shein mazte and sujamma but I don't believe he sells all four either.