Bob's Red Mill nonfat dry milk powder is made milk from cows that were Not treated with hormones. Dry milk lasts up to two years without refrigeration. Just whisk or blend dry milk powder with water in a 1: 7 ratio (powder: water) for liquid milk. You can also add dry milk powder to your baked goods for added protein and calcium - Check out the whole wheat pie crust recipe on the back of the bag!