Similar recipes all over. Use only the ones with tartaric acid in them. This one from the Daring Gourmet.
1 cup heavy cream or heavy whipping cream (35-40%)
1 cup whole milk (NOT ultra-pasteurized)
1/16 teaspoon calcium chloride , mixed in 2 tablespoons water before adding it to the cream
1/8 teaspoon tartaric acid , mixed in 2 tablespoons water before adding it to the cream