Tomato-Veggie Soup

1 lg can diced tomatoes (or 2 small cans)
2 lg carrots, chopped
2 celery stalks, chopped
1 medium onion, chopped
2 cups plain spaghetti sauce
2 cups water, vegetable stock, or chicken stock
garlic salt & Italian seasoning to taste

Place all ingredients in a large pot over medium high heat. Bring to a boil, then reduce to medium-low heat. Simmer for 20-30 minutes.