Question What coolant should I use?

Jul 29, 2019
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Well, I wanna make a gaming custom water-cooled pc, but I don't know almost nothing about the 'water' I will need.
But I think that I will use distilled water + biocide.
The problem is I don't know what biocide to use.
And also I wanna know what dye I can use.
P.s. I accept every single suggestion.