I feed pre-made raw by Primal, and most of their ingredients are organic. I like raw also bc the natural enzymes in the meat are intact, rather than cooked out.
As far as vitamins, it's really up to you. I like to give probiotics a few times a week and/or fish oil (Ark Naturals Royal Coat Express). For probios and supplements, I like this vendor:
Natures Farmacy Inc.