Sour Cream
["1 c. plus 2 Tbsp. dry milk", "1/2 c. warm water", "1 Tbsp. vinegar"]
["Place warm water in bowl; add dry milk and mix well.", "Add vinegar a few drops at a time, while stirring milk mixture.", "Mix until smooth; set in fridge a few hours to thicken."]
["milk", "warm water", "vinegar"]