From my Instant Nonfat Dry Milk box:
Chill bowl and beater. Whip 1/2 c. dry milk with 1/2 c. ice water until
peaks form (2 to 3 minutes). Add 2 Tbsp. lemon juice and beat until stiff
(1 to 2 minutes more). Fold in 1/2 c. sugar. Serve at once. For
interesting flavors, use ice-cold fruit juice instead of water.
I haven't tried this myself. Just thought I'd pass it on.