The bad thing about Mexican yogurt, even the Dannone and Yoplaits, is that they are loaded with sugar. Even the "natural" or plain yogurt has a tablespoon, an OUNCE, of sugar in it. That's 27 grams. It's frustrating!
For more than a year, I have followed Stephanie's blog adventures in A Year of Slowcooking. She has a recipe. I made it yesterday and it turned out fine!
Since we had no plain yogurt, I chose a strawberry Acitivia as the starter. This means I will save a half cup of what I made to be the starter next batch. Eventually, I will have totally plain yogurt. To make it, use the "American milk" you can get at Walmart of Mirtitas.
Stephanie also has a book out for Christmas based on the blog, A Year of Slowcooking. If you click the link, it will take you to crock pot yogurt.