Coolant Flush How many Green(Unknown) to Pink

[kk2002s]

I have Green coolant. I had bought a gallon of Porsche coolant a year back and it was pink. My research suggests I am either on the original coolant (Green before Pink) or somewhere before me someone switched to Non-Porsche
I have been topping off only with distilled so my 50/50 is off by now.
I will be flushing and going to Porsche Pink.
I have U-View tool so that's covered
How many flushes will clean.
I originally thought:
1 - tap water only flush
2 - Distilled water only flush
3 - Fill 50/50 Pink stuff/Distilled
Now I don't think introducing tap water into the system is a good idea even though I would flush with distilled after:
Is this sufficient ?
1 - Distilled only flush
2 - Fill 50/50 Pink stuff/Distilled