Divide tomatoes, tortellini, sweet peppers, and basil among three 1-gallon resealable plastic freezer bags. Add 1 1/4 cups water to each bag. Squeeze air from bag, seal, and freeze for up to 1 month.
In a large saucepan bring broth to boiling; add frozen ingredients. Return to boiling; reduce heat. Simmer, covered, about 20 minutes or until heated through, stirring occasionally. Season to taste with salt. If desired, top servings with Parmesan cheese.