Why risk drinking anything but bottled water, even for coffee, when you can purchase 5 gallon bottles from 25-50 pesos. For cleaning and cooking things like pasta, where you are boiling it first, tap is fine. Bathing and brushing teeth is a personal preference, Ive never had an issue using tap water, same for cleaning veggies...
I don't think you have to worry much about Cholera right now, but when in doubt....it's better to be safe than (very) sorry...