Personally, I know of no vendors that sell food and drink worth using. Make decent food and drink with a provisioner, ask a friend to make them for you, or buy from the broker. If you are playing on Halls of Fate or Isle of Refuge, I can make some for you.
Yeah, vendor trash food is super terri-bad. Make friends with Provisioner for sure. My wife must hate me, she cooks for me in both reality and virtually....although I do have to mow the Guild Hall lawn sometimes in trade.