I got some small plastic boxes that seal:
You can see bottle numbers on the side, and the bottles have numbers on the caps like so:
And I have a small excel sheet (and the flavor number in my flavor notes on ELR):
That way I can get the flavors I need for a recipe in seconds.
It really helps!
I am consindering getting a small fridge for my flavors, PG, VG and nicotine as well