To keep leftover soup safe, cool it quickly before putting it in the refrigerator. Place the soup pot in an “ice bath”—a sink filled with ice. Or stir ice cubes into the broth.
Never put a pot of soup directly into the refrigerator. Instead, pour the cooled soup into shallow containers, no more than two inches deep. Shallow containers ensure that foods will chill to 41˚F or below in less than four hours. This will prevent bacterial growth. Store soup in the refrigerator for no more than 3–4 days before eating it or throwing it out. Be sure to reheat cold soup to 165˚F or higher.
To learn how to freeze your homemade soup to make it go farther, visit AnswerLine blog, blogs.extension.iastate.edu/answerline/2016/10/24/
Source: Serving Soup Safely, food.unl.edu/free-resources/newsletters/serving-soup-safely