Pickling lime and kalkwasser are the same, both are calcium hydroxide.
Randy's two part(really three part) is Calcium Chloride, Soda Ash(baked baking soda), and Magnesium Sulfate(epsom salt) and Magnesium Chloride. Buckeye field supply, bulk reef supply, rocky mountain reagents, or the science company(aka Colorado Scientific) are the places I would source these if I was using them. I know people use driveway deicers and such, but I have read horror stories. They are not scientific chemicals, have no purity guarantee and most of the manufacturers have posted warnings not to use them for aquariums. RHF Reefkeeping article attached.
http://reefkeeping.com/issues/2006-02/rhf/index.php