Topping Up Hoat With Water

If it's disstilled should be ok, you can use any water in an emergency. But think they recommend you change coolant when you can.

 

I used Perrier (still, not sparkling....) when my Gpz900 overheated in South of France years ago, worked a treat
Shouldn't be a problem if it's just what was in the expansion bottle.

 

Not on a bike but a car, I actually used pee once when it was overheating
It was 3 in the morning and I was stranded on the M5 without anything else

 

Never used anything but tap water to top up or mix when using in my cars...bike's going to be no different.

 

Lol, also done that