Is it okay not to feed cats commercial cat food?

I just want to give my cats natural food like pork, chicken, turkey, duck, etc. Instead of branded cat foods. Even I don't want to feed them good cat foods like ACANA, Orijen, EVO, and natural instinct because I'm still not satisfied to ingredients like sun-cured alfalfa in Orijen, tocopherols (preservative) in ACANA, and natural instinct which contains something like clay.