Powdered Milk
Powdered milk is milk that has been dehydrated to the point of being totally dry. It is developed to increase the shelf life of milk, just like evaporated milk. It may be converted back to milk by adding water. It may, however, be used dry in some recipes, such as cookies and pancakes. To substitute powdered milk for evaporated milk, simply reduce the quantity of water you would typically add. This will produce a thicker product, similar to evaporated milk.
Because various types require varying quantities of water, you may need to experiment a little to find the correct consistency. Depending on how much powder you use, it will be nutritionally equivalent to evaporated milk.