safe

am thinking of taking the CELTA course in Buenos Aires in May. There is one in Recoleta and another in Sede Belgrano. I would probably be at the school the majority of the time during the day, and not go out far at night (if at all) but might try to see a few record stores and maybe Iguazu Falls...

I'm aware that the tap water in Buenos Aires is safe to drink, but I forgot that it doesn't taste great. Can anyone tell me where I can purchase a Brita filter in the city? Additionally, I'm looking for Coconut Water. I drink it before my Bikram yoga classes and would love to find it here...