I found mineral water in non-plastic bottles made of vegetable something. Like 30 pesos each so like 70 cents or so. Less than a dollar. So not crazy expensive but a little more. Plastic is probably the number one danger to humanity that is practically invisible. It's like the lead lined aqueducts that wiped out the Romans. People get all pissy about paper straws.
BTW that Coors is made in Puerto Rico and it's really good.