The idea behind a sick-day box is to have all of your sick-day supplies together in a place you can easily reach for when you do not feel like moving or cannot move very far. Work with your health-care team to personalize your sick-day box to cover all your health needs. Keep a list of names and important telephone numbers on a single page or file card in your sick-day box. A pen and pad of paper are among the most important items in your sick-day box. Every sick-day box should have a thermometer to check for fever.