A good substitute for evaporated milk is to combine one-quarter cup of half-and-half with three-quarter cups of whole milk to make one cup of evaporated milk. This is a suitable replacement for recipes that require a small amount of evaporated milk. Another substitute can be heavy cream, but it contains more fat.
However, it is also possible to make evaporated by using whole milk. It is a simple process that requires simmering about 3 cups of whole milk to produce about a cup and a half of evaporated milk.
Evaporated milk is a concentrated milk product which has 50 to 60 percent of the water content removed from it. This canned product was consumed during World War II because fresh whole milk was not readily available.