It is perfectly fine
Tap water in Puerto Rico must follow the same standards as tap water in the USA. So, you shouldn't worry about drinking it, you will be fine.
Of course, if you tend to have a sensitive stomach, drink bottled water... because in the long run, it is safe to drink but just as there may be some bacteria native to Florida which would make someone from California sick, the same could apply for someone visiting Puerto Rico.
We figured, why drink bottled water when the ice that was in our drinks was most likely not from bottled water, and we were fine. Tasted same as or better than the water in MN.
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