BRUCE!
Prednisone is a serious medication and you do not want to accidentally take extra. Amazon & Etsy have loads of pill containers for sale if you can't find something you like in the store.
I don't use one. For now, just line up the number of containers (dishes, old pill bottles, anything) that you need for the day and drop the pills in one of those for each dosage time. Label them if needed, and then put the dish/container away as you take your medication.