Well, it points to several places where there are holes in the safety net. It's not really for me to say in your specific circumstances whether I think it is either good/bad as an accommodation. In some instances yes, in others no. I'm not in your shoes, so there is detail that I don't have, KWIM?
There was obviously a reason why you wrote it in to begin with.
Are there additional steps that you/your child can take to make sure that the teacher's failure doesn't result in a system failure (not having epis on the bus ride)?
I can think of some questions about that:
1. Does your child CARRY? Or WEAR his meds? If the former, would making it the latter help? Possibly, IMO.
2. Build a by-the-door checklist that includes this item-- that is, rather than have teacher check for them in the classroom, maybe ADD that you check them before he gets on the bus, too. That's an additional safeguard.
3. I'm thinking that you have to hand some of this over to your DS as he gets older-- at 8, unless he has developmental issues that make it inappropriate, he needs to be at least TRYING to do this for himself-- with you and the teacher acting as coaches (aware coaches, to be sure, but coaching, not DOING for him). Maybe HE needs a checklist that he is responsible for-- hang it by the door, and put a copy somewhere on his backpack. Can be VERY simple-- "1. lunchbox? 2. epis? 3. backpack?" but I'd start there.