In large skillet, bring water and margarine to a boil. Slowly stir in pasta. Reduce heat to medium. Boil uncovered, 10 minutes, stirring occasionally.

Stir in vegetables. Return to a boil; boil 3 to 4 minutes or until most of water is absorbed, stirring frequently.

Stir in milk, seasonings, tuna and Italian seasoning. Continue boiling 1 to 2 minutes or until pasta is tender, stirring frequently. Remove skillet from heat. (Sauce will be thin.) Let stand 3 to 5 minutes for sauce to thicken.