Never drink unfiltered water in Costa Rica

I am currently recovering from a nice case of intestinal parasites from drinking unfiltered Costa Rican water. How could I have been so monumentally stupid you may ask. Well the thing is we have a refrigerator that dispenses cold water, and since the ice maker in the very same refrigerator was not functioning properly, and our bottled water dispenser does not have a cold water feature, I decided to go ahead and use the dispenser not knowing it was unfiltered. After taking a sip I noticed some floating "things" in the water. Which is odd because there is never any kind of debris in the ice when I use it. Anyway, parasites, pain, fever, and other very nasty stuff occurred. So it may be a bit before I post again. I have medication and am recovering.