Distilled or Regular Water

I agree with all the above. In all my years of working on cars my sink had a never-ending supply of water that worked fine. I never had a catastrophic failure but I have seen some crud come out when I flushed the cooling system. But, on a recent rebuild I used distilled water. It's only a few bucks and it's what I've always seen recommended. If your cooling system is empty why not try distilled as recommended? Even if there is some old coolant left it wont hurt anything.