The tap water here in Asuncion isn't good at all (because it is contaminated and has bacteria) and so I've been drinking and cooking with bottled water but lately I've been feeling really lousey and tired and so bought a test kit to test the water. So far I've tested two brands and found out I've been drinking the worse one. Dasani is advertised as being mineralized water and yet it had no healthy minerals, only bad ones (copper, cadmium, or cobalt, not sure because the test wasn't very specific). It had a really acidic PH which also proves it to be devoid of minerals. It also had bacteria. Seltz was better in that it had some healthy minerals (and the PH to prove it) and no bacteria. But it also had one or more of those 3 unwanted minerals. (Actually copper isn't bad in low dosages but I don't know it's dosage here if in fact it is here.) Also it has flouride added to it. So to avoid any more toxins I am buying a $164 water distiller that is made to use the local 220 volts AC. The distilled water eliminates 99% of all contaminants and actually aids your body in eliminating what toxins it has accumulated up to now.
I just tested two other brands of bottled water. De La Costa tested to have bacteria. It is untreated water from Paraguay aquafer. Aquafina is tap water purified thru a 7 step process. It did not have any bacteria.
Tap water in Asuncion usually has too little chlorine in it to kill all the bacteria but sometimes they put too much in which is really bad for the skin when you shower, and also bad for plants.