Probably one of the easiest things I've ever made. And I use this recipe at least once a week.
1 Tbs starter*
1C Hot water (I boil it in the kettle then let is sit for a minute)
1C Cold water (here, that's whatever temperature happens to come out of the filtered tap)
1C Whole milk powder
While the hot water is boiling, combine filtered 'cold' water, starter and milk powder in a sealable (I use a screw-on lid jar) 1L/1quart container. Still till powder is absorbed and lumps are gone. Add hot water. Stir again. Cover. Wrap jar in a tea towel and leave on kitchen counter** for a few hours or overnight. Refrigerate once solid.
*The word on the street is that you can buy yogurt starter . . . if you live in west Africa, just ask a neighbor for some. Once you've made yogurt, just save a little bit for the next batch.
**This works great if you live in the Sahel. If you don't, go to your local library and check out a book on homemade yogurt. But I warn you, you will never be satisfied with store bought again! Except for this great stuff you can buy in France that they sell in glazed terra cotta pots . . . YUM!