In a large kettle, combine 3 1/2 cups water, 3 1/2 cups milk, and 2 tablespoons margarine. Heat slowly over low temperature until margarine melts. While stirring, slowly add entire amount of soup mix. Simmer, uncovered, for approx. 1 hour. DO NOT BOIL. Diced ham can be added if desired. More water may be added for desired consistency. May crockpot on LOW for 4 hours, stirring occasionally.