Unlike BMW where the water is injected into the intake of the engine, I would think the quality of the water is far less important here (just sprays onto the outside of the IC).  Maybe regular water with some small amount of additive to reduce calcium deposits would be fine...


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18 GT3 Manual, 73 Carrera RS 2.7 Carbon Fiber replica (1,890 lbs), 06 EVO9 with track mods. Former: 16 Cayman GT4, 73 911S, Two 951S's, 996 C2, 993 C2, 98 Ferrari 550, 79 635CSi