I recently discovered a powdered milk that I could actually drink straight, in a pinch, and is perfectly fine on cereal. The trick is that it's a full fat powdered milk, not skim.
It's by Nestle and I've found it on some grocery shelves and at Walmart.
In smaller sizes than on Amazon and cheaper too.
Here's what it looks like on
Amazon. it doesn't take up valuable refrigerator space.
Note that with the Nido, be sure NOT to get the one with the baby on the label. It's different stuff, and generally more available.