When I did nails mobile, I used to put a dot sticker on the top (used nail glue) and number them. If you store them in numerical order it makes it so much easier to find the right one, especially when you have rather a lot of them. I used the Roo zip bags so if the number was say, 165. I knew which bag they'd be in without having to open them all up.
I also kept my stock inventory on computer and the number on the bottle was their unique ID number for my database. I could record how many sets I got from a bottle and also use it for reordering stock.
Before anyone asks, I sold off everything including the database when I stopped doing nails (became allergic!) but you can do something similar with a basic spreadsheet.