Uorik the Conqueror's Juice Cup
This brass cup changes the flavor of any water it’s holding. As a bonus action, you can whisper the name of a fruit into the cup. If the cup is filled with water, the water’s color and flavors change to resemble that kind of fruit juice. Saying the name of another fruit changes the water’s color and flavors again. Regardless of its color and flavors, the water is still only water. Shouting into the cup causes the juice to effervesce and bubble. If the water is poisoned, the drink tastes foul and badly fermented.
Uorik, the famously barbaric Dwarven warmaiden, had lost her tolerance to alcohol following her battle with the Wretch Witch of the Festerwood. Still searching for the comradery found only in the worst of taverns, she "commissioned" a local enchanter for the first of these now famous cups. Tales of her bar brawls live on, always ending with the dwarven victor screaming a battle cry of "GOODBERRY" into her cup. Even today, some taverns keep a jug of goodberry juice on hand to pour out to the victor of a friendly brawl. Knowing this, it's always a little strange to see a toddler running around with one of these copper cups in their hands.