This is a great “pantry soup”—that is, it comes together in minutes from ingredients that you can keep on hand all the time.
Heat oil in a large saucepan over medium heat. Add garlic, herbs and crushed red pepper (if using); cook, stirring, until fragrant, about 30 seconds. Add tomatoes, water and sugar. Bring to a boil; reduce heat and simmer for 10 minutes.