Pour into quart jar:
  
       3 cup water at room temp.
add:
       1 1/3 cup dry powdered milk
Stir until dissolved. Add:
       1/2 c. commercial buttermilk
       dash of salt
Stir until blended. Let stand at room temp. untill thickened. Stir just
until blended. Refrigerate. Stir before using. Save 1/2 c. buttermilk
to use as base for next batch.