I make a morning drink that consists apple juice, kefir, hemp oil, a green supplement and cacao powder. It is delish. Sometimes as a treat in the evenings I mix some Kefir and apple juice in a wine glass. I find Kefir and apple juice together real tasty.
It can be a bit overwhelming with all the info and books and add to it that many contradict each other so one has to find the one that resonates for you and dive in. That is still no guarantee cause it will always be a work in progress as you keep experimenting to find your own groove that suits you and your lifestyle