Powdered Milk...Will They Notice?

Yesterday, my kids ran out of the 2% milk they use and since I will not be able to buy anymore for the next couple of days, I decided to mix up some powdered and pour it back in the milk carton. I had an Enrichment Activity group meeting so I left them as they were eating dinner. When I came home, I ask dh if he gave them milk and he said yes. So, they will drink powdered milk without knowing that's what it is. Now since powdered milk is nonfat, I won't be doing that all of the time, but it is cheaper and can get me through some tight spots.