Heat the broth and the water to a boil over medium-high heat in a large skillet. Add the pasta and cook until just it's tender, stirring often. Do not drain.
Stir in the soup, milk and tuna in the skillet. Top with the cheese. Mix the bread crumbs with the butter. Sprinkle on top. Heat through.
TIP: Serve with steamed whole green beans. For dessert serve clementines.