Água de Coco

From Wikipedia:

Coconut water is the clear liquid inside young coconuts (fruits of the coconut palm). As the fruit matures, the coconut water gradually is replaced by the coconut meat and air. A very young coconut has very little meat, and the meat is very tender, almost a gel. Coconut water has long been a popular drink in the tropics. 

In Brazil, coconut water is called "água de coco," and is the second best-selling juice after orange juice. Coconut water can also be found in ordinary cans or tetra paks and is also marketed as a sports drink because of its high potassium and mineral content. In fact, one cup-full of coconut water contains more electrolytes than most sports drinks and more potassium than a banana. It is naturally fat-free and low in food energy (16.7 calories). 

Coconuts from various parts of the world differ in taste. For example, Indian and Pakistani coconuts tend to be sweet while Brazilian coconuts have a mild taste and Bangladeshi coconuts (due to the soil composition) have extremely sweet water and flesh with a slight salty aftertaste.

.