Pour water into a microwave safe bowl, and cook in the microwave until very hot, about 2 minutes at high heat. Add ramen noodles, and microwave 2 minutes more to cook.
Drain and discard water from noodles, then stir in seasoning packet, tuna, and American cheese. Place back into microwave, and cook until hot, 1 to 2 minutes more. Stir before serving.
