Punch needle requires a lot of embroidery floss!
I keep my floss organized in a fishing tackle box with drawers.
I have each drawer labeled with the color so I can easily find what I need.
Even after I started organizing in the drawers,
I found it difficult to remember when I went to the store just what I had and what I needed.
That is when I discovered the StashCache app.
It is for Android phones and made for cross stitchers, but it works just great for punchers, too!
It has a place to list each of the patterns you have.
In the pattern, it allows you to list the fabric, floss, and embellishments needed to complete it.
You can log your current inventory, tell it which patterns you want to make, and it will create a shopping list for you!
The developer also has a nice tutorial to help get you started.