Nice to see everyone getting into the spirit of things!

The powdered food I am most interested in is that I produce myself from dehydrated stuff. No preservatives, additives, etcetera, except perhaps a little salt. Frozen to kill bugs. Vacuum sealed in relatively small containers / bags with oxygen and water absorbers. Stored in the proverbial cool, dry place. Rotated out and eaten by at least 12 months.

Because I cannot figure out how to dry and powder some things, like milk, I also am interested in some commercial powdered foods.

This is just part of a solution, but because you can control a lot of the contents, I think powdered foods, especially DIY stuff, deserve consideration.