I've been using my food storage powdered milk for everything except for drinking. Bryninn and I made this to go with our strawberries the other night, and it's pretty good!
Mix 1/2 cup powdered milk with 1/2 cup cold water. Beat to soft peak stage (4 minutes at medium-high). Add 1/2 teaspoon lemon or vanilla extract, and beat 6-7 minutes at the same speed. Add 2 tablespoons sugar and beat for one minute at medium-high and enjoy!