If its treated water you have many things added and perhaps even some not on the label.
I figured out my Distilled Tab water had an issue when I couldn't make Colloidal Silver from it. This led me to first ozonating it which worked for years until they snuck Chloramine in it. Then CS didn't stay clear again. adding Citric Acid during first boil breaks the Chloramine bond and then its just Chlorine.
So the moral of the story is, make CS with it and check the result..