I’m a 40 year old CAH (non salt-wasting) male who recommends you "stash" Solu-Cortef and/or extra oral meds anywhere your son might need it.  ie:  your cars, a golf or gym bag, his locker, etc.  Since it has never been practical in my life to carry one type of bag, this method of stashing has worked well for me.  If there is an adult, such as a nurse or a coach, on hand in specific activities, I would recommend confirming that they know how to administer the injection, and are willing to do so. 

Hope this helps -- Eric