I have always used tap water. It comes from the utility chlorinated, and softened. Then it runs through my house softener. So I guess it's ultra soft?
From the tap its Ph is around 8.5.
I don't do anything to it, other than knock it down to a Ph 6.5 with GH Ph down. I do use Calmag because it's so soft.
If it's fit for human consumption, is it really going to hurt my plants?