Here is a picture of mine filled with supplies:
As you can see I used labels on the side of the organizer so I would know where each ink color belongs. My kids will use them and not put them back in the right spot or I will take out a bunch and can’t remember where they go. I have mine sorted by the CTMH color families with the Neutral colors on the bottom. The best deal is to purchase the entire organizer (or earn it as a 1/2 price item with a qualifying gathering) but you can also purchase it in pieces as you need them.
I purchased the Re-inker Tray way before I bought any re-inkers. This tray can be used for anything! Throughout the years I have used mine for a variety of things including embossing powders, other ink pads, sponges/daubers, and glitters.
Another item that goes along with this that I like is the Z4136 Organizer Carrying Case $34.95. If you travel and take your supplies with you it is a worthy investment.