C-41 chemicals can be mixed from raw chemicals, but CD-4 is at least a "special" component not available everywhere. There are formulas for developer but they may not be perfect. On the other hand, Kodak/Fuji C-41 chemicals are SO cheap that just buy them.

I highly recommend also to print color -- that is, RA-4 process. It's an easy step if you are already familiar with BW printing. Buy Supra Endura paper while it's still available...