A Thermos can come in handy in multiple situations. Use one on outings and camping trips to tote along coffee or hot chocolate. Or, use a Thermos to pack homemade soup for hot lunches on-the-go, for work or for school. A Thermos will keep the soup warm for hours. If you store the soup in your Thermos properly, you will have a hot treat, filling you when it's time to eat.
Turn your tap water on its hottest setting. Fill your Thermos with it. Screw on the Thermos' top. Set the Thermos aside while you continue food preparations.
Place your soup in a pot on the stove. Heat it to boiling. Stir, if necessary, while it comes to a boil.
Turn the heat down on your burner. Let the soup simmer for five to 10 minutes.
Open the Thermos. Pour the water out.
Pour the soup into the Thermos. Screw on the Thermos' cap. Ensure it is snug.
Heat your soup on the stove rather than in a microwave. The stove will heat the soup more evenly, allowing better heat retention.