The single best option for refreshment on a scorching hot and humid day on Ipanema Beach in Rio de Janeiro is a fresh coconut. For about US$2 you can get a whole coconut (definitely ask for a chilled one from the back of the cooler! - "um coco gelada, por favor"). The purveyor will whack the top off with a machete and insert a straw. With its amazing electrolyte and potassium content, you get a healthy and refreshing treat...and it doesn't get much more local than this flavor!