Milk alternatives include: soy milk, almond milk, coconut milk, hemp milk and rice milk. Most of these milks are fortified in calcium (meaning they add calcium to it) and with the exception of soy milk, contain low to no protein. You may choose a milk alternative if you cannot tolerate dairy, or if lactose intolerant, you may choose a lactose-free milk.
Bottom line: There are loads of milk alternatives available. If you would like to find out which is best for you, ask your dietitian.