you'd be better off with distilled or ro, but there's nothing wrong with tap, either. I used quite hard tap water for a few years and lately been using softened water due to ease / convenience and having no problems with that either.
Th econcentrations of what is in it are fairly low as far as what would impact the plant... might need a little more magnesium or calcium but won't be a ton difference. I haven't had to change how i dose my plants since ceasing using plain tap. it's been enough days to see if any Mg issues cropped up (those Mg-specific symptoms lag 30 days behind or more and no Ca-def signs since then either).