I AGREE!! Why take the risk? You don't notice acute symptoms because your system becomes accustomed to the contamination over time. Eventually, the dreaded gastritis takes hold. The incidence of gastro-intestinal ailments and worse (e.g. cholera) in developing countries is very high. It's inconvenient and very slightly more expensive to use bottled water for everything other than washing hands and dishes in the kitchen, but it's very much worth it in my opinion.
OK, now we will hear from all the long term experts who will declare it's OK to brush your teeth and drink the water. To them I say God bless and good luck with that.
At our DR home, we have well water. It was tested a couple of years ago and was impressibly uncontaminated. Me, being the untrusting soul that I am, figures that a week after the testing who knows what contaminants could leach into the water. We used to use it for coffee, cooking rice/soups/etc., anything boiled, but last year we stopped and only use bottled water for all of that. I have a Brita pitcher in the fridge that I run the bottled water through.
Beginning last winter we started putting chlorine tablets in both the cistern and the tinaco, next trip we're bringing down the chlorine floating dispensers. Obviously, we no longer use that water for anything except bathing, washing dishes, doing laundry and irrigation.
I'd rather be safe than sorry.