Phil-Jamo lives in paradise where you don't need AF.
Don't run plain water. You said you don't get over 200 (that can't be right) so you don't need water's heat transfer.
You need winter protection and the raised boiling point of a mix. Use AF and distilled because of your ally radiator. And yellow AF has not hurt my system in 27 years.
Beware of myths and wives tales told by The Oracle...
