I am currently thinking about what coolant I should use for my loop. I read somewhere that using dyed coolant will stain your components, but I also read that using plain distilled water will lead to bacteria forming. What should I do?
"Also, this is a wise time to consider additives for your water. Almost all seasoned watercooling veterans will tell you to use only distilled water and either a biocide (such as PTNuke or similar) or a KillCoil...or both. A killcoil is a coil of .9999 pure silver that you drop into your reservoir to inhibit growth of algae and other critters. Most will highly advise against using premixes; some of these even precipitate out and can clog your blocks. "
But I was told by some people that the additives don't work or something...
You don't need it- it isn't going to add any benefit of being in your loop unless you are running aluminum in your loop.
Distilled and some biocide works fine. I picked some up at Walmart for like $3 in the fish food area, but a lot of people get stuff online like PTnuke from Petra's Tech Shop, for example. Most sites that sell watercooling gear sell biocides. You should at the very least run biocide in your water, kill coil is optional.
I've ordered from all sites above with great success- all top notch online retailers. They all offer international shipping of some sort, but I'd recommend emailing them first. You can also try www.aquatuning.com.