Nacho Cheese Soup

1 can (11 oz.) whole kernel corn, drained
1 can (14−15 oz.) diced tomatoes and green chilies, undrained
hot pepper sauce, to taste
2 cups water
1 package (5 1/4 oz.) Au Gratin Potatoes (with cheese packet)
2 cups skim milk
1 cup (about 5 oz.) light Velveeta cheese, cubed
In a large pot, combine the contents of the Au Gratin potatoes
package (with cheese packet), corn, tomatoes, and water. Mix
well and bring to a boil. Reduce heat, cover and simmer for
15 to 20 minutes or until potatoes are tender. Add milk,
cheese, and hot sauce. Cook and stir frequently until the
cheese is completely melted.