Do not let perfection be the enemy of good is what I always say. Like you said in another comment, RO is the best we have right now.
I just recently learned that RO is pretty acidic so I bought this filter that should alkaline the water and attempt to add some minerals back into the water on its way to the faucet. I’ll post the link if you’re curios. I haven’t received the filter yet so can’t do any TDS or PH testing.
This is a referral link for a coupon, I’m not affiliated, just saw this in my email inbox, feel free to use or not.