Add more or less of each item depending on your specific personal or group needs. You may just want to put all bandages, all instruments, all pills, etc. into their own compartment. The choice is yours. If you already have a first-aid kit you prefer, consider retrofitting it now that you have the time. Check to make sure it contains fresh and useable items.
Bandages tend to loose their adhesive power over time and medicines do have expiration dates.
Now is the time to inventory what you have, and determine what you may need. Become familiar with what items and where they are in your kit, you may have to get to them quickly on the trail. Whether backpacking, hiking, going on nature walks or on a family camping trip, if you have the young children along you better be somewhat prepared to attend to their boredom times. Put on a coat of polyurethane to protect and seal the wood. Make the checkerboard on a piece of non-gloss nylon or old canvas by taping it out with masking tape and having the kids apply some thinned paint to make the squares.