Once per game, as a Standard Action, the owner may speak the command word to fill this cup with clean, potable water. It’s just plain water with no special or magical properties. The water lasts until it’s used, spilled, or evaporates–just like any other mundane water would.
Equivalent to 50 GP
Gold Piece or GP equivalent tokens may be hoarded as treasure, traded with other adventurers (big-time token collectors may be especially interested in GP),