Substitutions for Milk

Substitutions for Milk in Baking

Milk is one of the easiest ingredients to substitute in baking. Non-dairy milks and water are suitable replacements with only subtle effects on taste and texture. Some ingredients may affect the coloration of the finished product. Soy will often cause a darker color or browning effect. Another consideration is that not all liquid replacements are as thick as milk; therefore, the amount used may need to be reduced from the amount called for in the recipe.
Soy Milk: 1 cup soy milk = 1 cup cow's milk
Rice Milk: 1 cup rice milk = 1 cup cow's milk
Depending on the brand, rice milk can be thinner than cow's milk and you may need to reduce the amount used in the recipe. For baking, you can add 2 or 3 extra tablespoons of cooking oil to help offset a watery consistency.
Nut Milk: 1 cup nut milk = 1 cup cow's milk
Nut milks, such as almond, are best served in dessert recipes.
Juice: Fruit juice can be used as a replacement, but can impart sweetness. Juice is also acidic and is best served in recipes that include baking soda. The amount used will depend on the thickness of the juice.
Water: Approximately 3/4 cup water = 1 cup cow's milk
Water is commonly substituted for milk in recipes. Add water last to the recipe, stirring in small amounts until the proper consistency is achieved.
Note: Milk substitutes may still have dairy ingredients in the product. Many brands claim to be dairy-free, but in truth they only eliminate lactose. Dairy protein (casein) is commonly included in both soy and rice milks. Also, many brands of rice milk are not gluten-free, such as Imagine Foods Rice Dream, because of their manufacturing process. Always confirm the status of rice or soy milks if you are on a gluten-free diet and/or dairy-free diet.
Other dairy substitutes, such as non-dairy cheese, will often use dairy or soy protein in their ingredients. Always check the ingredients and/or with the manufacturer to make sure that the product is completely dairy-free. There are currently no known cheese substitutes that do not contain either dairy or soy protein ingredients.

http://www.dianasdesserts.com/index.cfm/fuseaction/bakingtips.ingredientsubstitutions/IngredientSubstitutions.cfm

Note: Also Coconut milk can be used as a substitute for milk, and sometimes as a substitute for cream. Source: my opinion.