Reconstituting powdered milk is not always a matter of simply adding a given amount of water. There are many types of powdered milk available, and the ratio of water to milk varies with the product. Powdered cow's milk, goat's milk and soy milk all require specific amounts of water to reconstitute the dry milk powder. Use the correct amount for your dry milk product to avoid a runny or overly thick reconstituted milk.
Non-instant Cow's Milk
Non-instant cow's milk requires warm water and vigorous mixing for it to completely dissolve into fluid milk. For best results, mix non-instant cow's milk in advance and chill it in the refrigerator until cold. Mix 3 tbsp. non-instant cow's milk with 1/2 cup warm water with a whisk or blender until the milk powder is completely dissolved. Slowly pour in another 1/2 cup warm water to make 1 cup of milk. Use the 3 tbsp. per 1 cup of warm water ratio for scaling up or down to different amounts. For instance, use 1 1/2 tbsp. milk and 1/2 cup water for 1/2 cup of reconstituted milk.
Instant Cow's Milk
Instant cow's milk dissolves easier in water than non-instant, and you can mix it with cold water. Use a ratio of 1/3 cup dry, instant cow's milk powder per 1 cup of water. Use this same ratio for other amounts. For instance, to make 2 cups of reconstituted milk, use 2/3 cup powdered, instant milk and 2 cups water. Use a shaker, blender or whisk to combine the powder and water. Slowly add the water to the powdered milk in a stream while stirring for best results.
Goat's milk is often an alternative for people who cannot drink cow's milk. Powdered goat milk is available in health food stores. Blend together a small amount of warm water with 4 oz. powdered goat milk to create a paste. Blend this into 1 qt. water to make 1 qt. of liquid goat milk. Treat the reconstituted goat milk like fresh milk and store it in the refrigerator. Use 12 oz. powdered goat milk to make 3 qt. of prepared milk.
Soy milk powder has a 1 to 4 ratio of powdered soy milk to liquid. For instance, to make 1 cup of soy milk from powder, use 1/4 cup powder blended with 1 cup of water. Shake together or use a blender or mixer to combine the powder and water. Add the water to the powder slowly while mixing to help the powdered soy milk dissolve better without clumping. Chill the reconstituted soy milk in the refrigerator until ready to use as a beverage.