How much fluid do I need? Also, Mayhems, or water?

[Gepetto]

I'm just about to order from OCUK and I'm just wondering how much fluid I should get. It's for a 240mm rad, EK150 res, and heatkiller block, in an Antec 300. CPU cooling only.

Also, most of the pointers on here seem to aim towards distilled water and a silver killcoil. Now, I want red, so I'm considering the Mayhems pre-mixed (as there are no dyes in stock) and would it be correct to assume I could then add Mayhems H20 or (distilled water) to the premixed at a later date?

Also is it OK to use a killcoil with dyed fluid, or should they be used with distilled water only?

Sorry about the noobie questions, but first real foray into watercooling.

 

[Gepetto]

Bah, bung a litre of Evian in there, sod all the distilled lark

Surprised you didn't suggest milk, Kainz!

Thanks guys, will go for a couple of litres of the premix to begin with, and work from there. Cheers!