I always drink bottled water when in the Tropics. In Ghana, I hadn't remembered to get some at the airport before arriving late at night at my hotel in Accra, so I brushed my teeth from the tap like a twit before going to bed. The resulting health problems were quite spectacular, as I contracted Giardiasis (a gut parasite). My intestines were shot to pieces and my face went completely grey. It took two courses of strong antibiotics to shift it.
My husband is in Ivory Coast at the moment for the funeral of his dad, and my last words to him were, "Please please please don't drink the water! Get bottled stuff!" I hope he's doing as he was told!