Hello Mr. Rawles,
Here is a link to Chow How  that I thought some of your readers might wish to print out and add to their preparedness manuals.
It tells you how to add the fats back to powdered milk (with oil) to make whole milk. It is important that toddlers have the fat for proper brain growth. It would also be a good idea for pregnant women to have the extra fats.
Hope this link is helpful to some of your readers. Sincerely, ~ Garnet