KEFIR

JugbandiBlog says making kefir is easier than making yogurt, .and has instructions

The KefirLady has more.

Kefir vs Yogurt LINK

In the US, I used to make my own yogurt, but haven't gotten into it here, probably because milk, even local carabao milk, is expensive.
Here in the Philippines, although they sell some yogurt at the supermarket, the local product pushed for health is Yakult, originally a Japanese product (our neighbor, a Seventh day Adventist, is the local distributer).

Information on probiotics HERE.
as we take more antibiotics (That kill off the "good" germs of our body) probiotic use may become more and more important.
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Related item: the ability to digest lactose is proof of evolution, with the trait evolving in two separate areas of the world over the last 10 000 years.