I use the liquid RIT dye & just boil water in the microwave & do it in some glass bowls of mine. I do a lot at once b/c the colors come out different EVERY time I dye. I never get them the same. lol.
Here is the RIT color chart that I use. It usually works. I have all the colors that I've gotten from joann (slowly got them using 40% off coupons http://www.ritdye.com/colorit_color_formula_guide
I've also used TULIP dyes & they work okay, but they are not as dark and take forever to set.