I test my bottled water and it has ~4ppm of stuff in it... my well water has ~400ppm of stuff... I would rather drink the purest one... I could buy a reverse os

I test my bottled water and it has ~4ppm of stuff in it... my well water has ~400ppm of stuff... I would rather drink the purest one... I could buy a reverse osmosis system to purify my water but I would not be saving money. The people in my city that have city water often complain about cloudy water, so it's not any better (maybe worst).