I'd strongly suggest you take a moment and read up on the newer generation coolants. OAT, non silicate coolant is what you need. Imho, buying premix is for suckers. You can get a gallon of distilled water at Walmart for 88 cents.
Most of us like Burner's videos:
https://www.youtube.com/watch?v=EMkoxlm6mzI
I use Prestone Dexx-cool btw. The orange stuff.