Potassium Bicarbonate

Used in wine to reduce the acidity of grape or fruit wines, and in beer to add a temporary hardness (generally to reduce the mash pH of dark beers).

Potassium bicarbonate is also a contact fungicide. It can be used to kill the the fungi responsible for powdery mildew on grapes. Approved for organic growing.

Can be used as a baking soda replacement.