Iced tea with a swirl of dwarven syrup comes to mind or some fruit could be very very nice & sickly.
With all those exotic ingredients we will have to keep an eye on the FPS!!!!
By that point @GoblinCookie it would pretty much be a 'social function' mug alterative rather than a liquid holder, unless taverns ESPECIALLY asked for teapots & jugs to use to pour exact amounts into dwarves cups.
The social function part is optional, you could simply use a teapot to carry water to drink in adventure mode for instance, so mechanically it is very much an ordinary liquid dispenser like a jug. Having jugs in taverns along the lines your describe would go a way to making taverns more efficient, instead of having to get a mug for each customer, the customers all take a mug when they arrive and then the barman goes around with a jug of alcohol to serve them.
Admittedly that isn't generally how taverns work in RL, but it is certainly more efficient.
I don't understand why dwarfs, which need alcohol to get through the day, would ever see tea as something other than water that has been polluted. They would be suspicious about drinking it, and would make jokes and rude comments at a "tea ceremony", and generally do anything except drink the tea.
How narrow-minded of them.....