Here in Brazil it is sold everywhere. It is fantastic chilled, a hole is cut into it and a straw inserted. It is not just at beach bars either, I have had this at friends homes as well.
We have several trees here on our farm and so we have a continuous supply.
It is very good for you and I believe it could be used intravenously in an emergency for rehydration.
It is often give to people to help them recover from illness and was even suggested for my dog when he was ill.