; COOK TO SAFE INTERNAL TEMPARATURES; AND KEEP FOODS CHILLED. Karlsons: It's a good idea to put a freezer gel or a frozen drink box in the lunch carrier, to keep sandwiches cold until lunchtime. We recommend insulated lunch boxes that keep food cold or hot and are easy to clean. You also want to put some moist wipes or gel sanitizers in with lunch. They're great for washing hands, surfaces and utensils, and they're easy to pack in a lunch box or bag. If you pack hot foods, use ...