First, read the comments which follow this blog post. There are many good idea there.
Second, note that the author used NON-FAT powdered milk. This works, but gives a different taste and texture than full-fat powdered milk or than fresh whole fat milk.
This works as a prepper food because the ingredients are likely in your food stockpile. The vinegar can also be made at home.
http://tacticalintelligence.net/blog/how-to-make-cheese-from-powdered-milk.htmNOTE: do save the whey (liquid) for use in other recipes.