In a large kettle, combine 4 1/2 cups water, 3 1/3 cups milk and 2 tablespoons margarine. Heat slowly over low temperature until margarine melts. While stirring, slowly add entire amount of soup mix. Reduce heat and simmer, uncovered, for 1 hour. DO NOT BOIL. Optional: Add 1 1/2 cups ham (rinse, to help remove saltines) and/or 1-1/2 cups corn. Add at least 10 minutes to simmering. Can also crockpot on LOW for 4 hours.