In Soil: Use RO or Tap Water?

[Mozzy]

Can I/we also presume that the water source has no impact on living soil, microflora, etc., something no one has mentioned?

I believe this is the reason for off-gassing or dechlorinating the water by hose-filter etc....the rest is likely very water-specific, like how some folks need to PH just a little (my tap is over 8 on the natural I believe), and others can give it straight to their plants (post-chlorine). Some folks' tap water may not be nice, or even fit for human consumption in some places unfortunately