BROWN meat in large skillet; drain.
ADD salsa and water; stir. Bring to boil. Stir in macaroni. Reduce heat to medium-low; cover. Simmer 15 minutes or until macaroni is tender.
ADD corn and 1 cup of the cheese; cook until cheese is melted and mixture is heated through, stirring occasionally. Sprinkle with remaining 1/4 cup cheese; cover. Let stand 1 minute or until cheese is melted.