I think it's pretty clear: at 90 ppm, this mineral water is essentially mineral water, period. It's like arguing that water is compressible (it is, but it's so small that it's not worth mentioning).
If some of that copper managed to find it's way to the copper surface of the waterblock, it would only add an irregularity to the block's surface, and certainly wouldn't be bonded to it in any way that would improve heat transfer.
As for the coolant itself, again, at 90 ppm (parts per million), it's just nowhere near enough to make any kind of difference.
...but I know a real estate agent in Florida that can hook you up with...
At 90 ppm, it's a dietary supplement: heck, I've used copper, silver and gold, as supplements to my immune system (my mom's idea, don't ask!).
If you want a better coolant than water, I'd google around: I believe that there are long-complex molecule chains that might be better than water, but it's hard to seperate all the data from compressed refrigerants, to liquid coolants.
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