I also bring lunch to the company every day. This is how I do it: prepare the meal in the evening, put the next day’s lunch into a lunch box without a lid, and wait until I pack it before going to work the next morning. Just close the lid again. If you want to put it in the refrigerator at night, you can wait until the food is cool, close the lid and put it in the refrigerator. However, now that the weather has turned to cooler autumn, you don't need to put the dishes prepared in the evening in the refrigerator.