I have just put up my first dried foods (beans, rice, peas) using Mylar bags and was looking at purchasing 40 lbs. of instant potatoes when I realized that one needs either Olive Oil, Butter or Margarine or probably even a bit of cooking oil to make them. But, oils will go rancid with time so... So, what do people use as replacement for oils or how does one store oil long-term? Maybe best to forget the dried potatoes?