This item can come in nearly any form, from a porcelain mug, to a glass bottle, to a wooden keg.
You can use an action to command this container to steadily heat or cool its contents at a rate of 10 degrees Fahrenheit per minute until commanded to stop. It will then maintains that temperature until it is emptied or a new command is given, though it is unable to reach a temperature above 212 degrees or drop below 32 degrees.
You can also use an action to command it to mix its contents homogeneously, though it will not keep them mixed afterward. (For example, oil and water separates again at a normal rate.)
Finally, you can use an action to command it to fill itself to the top with whatever liquid or combination of liquids is contained within it at that time. You can only use this ability to generate nonmagical, drinkable liquids, and no more than one gallon of liquid each day. Magical potions, poisons, dragon blood, and the like can not be generated in this manner.
Bartender's friends are especially valued in hot desert countries, where a glass of good, chilled wine may be worth more than gold to a decadent Pasha. In more temperate climes, wizards sometimes give them to innkeepers in exchange for very special services.
Adapted from Dragon Magazine Annual 2.
Image generated with Stable Diffusion.
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