I’m my experience, the little brown ones are always ibuprofen and if it’s orange, it’s my ADD meds. If it’s got cute stars and happyfaces stamped into it, it’s probably illegal. Pill colouration is intended to be distinct entirely for the purpose of identification.
Now, obviously not everyone knows what pills look like (that would make sense using the first aid skill to know your shit, I like that suggestion), but it certainly wouldn’t be a case of changing potion colours like we get in nethack. Pills are constant.
My personal thoughts regarding a compromise would be to keep labelled meds as they are, and just have a new item labelled ‘unmarked pillbottle’ that can be any one thing. No ‘making containers work and re-assigning all drug items’. You get your Fun, but don’t remove anything we already have established. You’d use the stuff you trust first, but if desperation called for it, you could chance the iffy bottle.