Every situation is different,but to me, an ancient desert rat, the problem with powdered foods is that they almost always require adding water. Where I have roamed a lot, providing water is precisely the problem.

If weight is not an issue, I go with canned goods - rarely would you need to add water in prepping them. If weight is a factor, then you have a proper role for powdered or dehydrated items, but be sure of your water supply. One of my faves for dense nutrition is almost any kind of nut - pecans, walnuts, almonds. Tasty and healthy, especially if you are working hard.

I heartily agree you had best sample the items before you lay in a year's supply. Powdered milk works great is some situations, but it is very poor in others.