I've been using distilled water for decades, whether with anti-freeze or not. I add Water Wetter, whether anti-freeze or not.
Seems to me the lack of minerals is a good thing for cooling systems, and my radiators that are 30+ years old and still in excellent internal condition seem to back that up.
Out of curiosity one year I put a sacrificial anode in one radiator and it showed almost no corrosion.
I change the water in the racecar out every couple of years, the coolant mix in the other vehicles maybe every 5 years, never seen anything to worry about.