Mapro lemon barley water natural body coolant. Helps clear the urinary system. Barley is best known for its digestive and coolant factors. When mixed with lemon, it makes a nutritive, delicious drink with the added goodness of vitamin C. 'Lemon barley water' has been associated with wimbledon, it is the official drink for players. Make your own drink by blending one part of Mapro lemon barley water with three parts water or soda.