Green Copper Ewer

Any poisonous liquid poured into the ewer is instantly transformed into an equal amount of sweet wine. Furthermore, a creature that grasps the ewer's handle can command the ewer to fill with 1 gallon of wine, and it can't produce more wine until the next dawn.
Many unscrupulous Barovians and Vistani would kill to obtain this ewer. Others would gladly pay for it or accept it as a gift.