Make 24 - 36 meatballs. Brown about 8 minutes. Drain. In a large stock pan, stir together undrained tomatoes, broth, beans, water, and all seasonings. Bring just to a boil. Add bows. Reduce heat to gently but continally cook the pasta (8 minutes). Add spinach, mushrooms and meatballs. Serve now: simmer to heat through (20 minutes). Serve later: Turn heat off. Cover and let stand no more than 30 minutes. Reheat gently (10 minutes on low) and serve.