During Prohibition, "wine bricks" were a clever way for the wine industry to circumvent the law.

These "wine bricks" were blocks of concentrated grape juice and marketed as a non-alcoholic beverage.  Producers would sell these bricks with instructions on how to dissolve them in water, but also with warnings against fermenting them, thereby staying within the confines of the law.

“WARNING: After dissolving the brick in a gallon of water, do not place the liquid in a jug away in the cupboard for twenty days, because then it would turn into wine.”