Brown meat and drain off the fat. Add water, uncooked pasta, tomatoes, and SOS mix. Simmer covered for 20 minutes or until macaroni is tender. Remove from heat, add cheese. Put cover on for 1 minute or until cheese melts. Combine all ingredients in a re-closeable plastic bag, mixing well.. No refrigeration needed. You can also use SOS mix to substitute for 1 can of cream soup: Combine 1/3 cup of mix with 1 1/4 cups of cold water. Cook and stir on stove top or in microwave until thickened. Add thickened mixture to casseroles as you would a can of soup.