I recommended Nestle pure life water just in case if your won't find distilled water or your are in a hurry. At least all mineral waters are filtered properly so no dirt is present in it. However, I agree that the distilled water is being produced with a different process called as Water De-mineralization or De-ionization process in which all the bicarbonates of calcium and magnesium and other detrimental impurities like ferrous, sulfates, nitrates and silica are thoroughly removed which prevent scaling and rusting in the radiator tubes and cooling system. I myself a chemical engineer and I have been working on these plants for many years. So it is always better to use a reputed company distilled water. A/C drip or condensed water is not considered to a safe and fully clean water as it also gathers environmental impurities due to exposure from atmosphere and surroundings.