Bring water to boil; gradually add noodles so that the water continues to boil. Cook 8 - 10 minutes; drain noodles and put back into saucepan. Mix soup and milk together in a bowl until blended. Put soup and chicken with noodles and mix; put into buttered casserole. Melt butter; mix in crumbs and spread over casserole. Bake for 15 minutes at 375 degrees.