For the second time, my daughter broke the Thermos bottle and I will not be buying anymore of that fragile mirror like container that goes into the Thermos soup container. It was to keep her heated foods HOT and cold foods cold. Is there anything else I can use that would do such a good job? I thought about spraying foam inside of the cavity but I know the bottom lid is screwed on but eventually it probably would mold. Broken syrofoam pieces? What you all suggest to do?