In the past I use a small plano organizer like these. I wrote in black marker (super-fine tip sharpie) on the outer case what each med was, then to make things easier I either used a small sticky label or a small piece of index card on the divider to identify each medication, dose and exp date.

Since finding minimus.biz I stopped using this method for my kits, but I still carry my OTC meds like this in my briefcase.

I do recommend a rubber band to make sure it stays shut. These cases are pretty secure, but in my case it is a reminder to shut the darn case all the way.