Source: Tyranny of the Dragonqueen (Errata)

Wondrous item, Common.

This golden stein is decorated with dancing
dwarves and grain patterns.
If you speak the command word (“Illefarn”)
while grasping the handle, the tankard fills with
three pints of rich dwarven ale. The tankard has
3 charges. Using the tankard’s property expends
1 charge, and the tankard regains all expended
charges daily at dawn.