Dehydrated potatoes are actually the same as instant potatoes, and this latter term is probably more familiar to you. If you are like thousands of other Americans, you buy dehydrated potatoes on a regular basis and frequently use them in your cooking. Ingredients in potato : Monocerides, Diglycerides, Sodium acid pyrophosphate, Sodium metabisulfate, Citric acid, Butylated hydroxytoluen.