Originally posted by Misuki:

You can't craft them. They're basically special tankards you can get from venturing.

Originally posted by Skunktaur:

Found one and when I used it, it activated a minor stamina mead. Then on a second use, a minor healing mead. I'm not sure if it's automatically yanking mead items out of my inventory yet; didn't check carefully.

Tankards, when used, automatically uses your first mead from you inventory, starting from the left. Kinda odd equipment tbh and kinda repeatitive since you can just place the mead on that same slot on where the tankard is.

Then they are the most obscure items ever to be found in the game, literally just the 2 i found under the floor and never seen them again.

@Skunktaur
They are for roleplay reasons, you drink a mead with a different animation, but it just uses the first in your inventory.