How do you keep food warm in kids Thermos?

To keep food warm in a kids' Thermos, preheat the Thermos by filling it with boiling water for about 10 minutes, then empty it. Next, add the hot food, ensuring it's freshly cooked and steaming. Seal the Thermos tightly to maintain heat and store it in an insulated bag if needed. This method can keep food warm for several hours, making it suitable for lunchtime or snacks.