I drink/eat/have yoghurt or butter milk every day. I have tried different kinds and on all of them it is written they contain live cultures of bacteria.
Sorry for disappointing you but all kinds of youghurt or buttermilk contain powdered milk.
That's not true. As I don't drink yoghurt, I'll comment only the buttermilk (maślanka), with 2 examples (of my favorite producers from the region I live):
Jogo (£ódź) - live cultures of bacteria, no powdered milk,
OSM £owicz - cultures of bacteria (the label doesn't mention "live"), no powdered milk.
I simply don't like the taste.