In a 1-gallon freezer bag combine tomatoes, the water, tortellini, sweet peppers, and basil. Squeeze air from bag, seal, and freeze for up to 1 month.
To serve, 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 each serving with Parmesan cheese.