Really depends on how you define "bare minimum."
I define the minimum as having organ support, aromatase/prolactin support on hand, and then a SERM. For most orals you could get away without having a SERM and just let the body naturally recover, but that's not guaranteed by any means. You could also skip the on cycle support as the liver is very remarkable at regeneration. Our bodies take a beating, and 1 cycle won't do too much harm. After 1 or 2 you'll start to really want all the bells and whistles.