I know a couple of folks asked about the dropper bottles I use to make my travel kit. While I'm sure there's plenty, I bought the Vivaplex, 24, Cobalt Blue, 10 ml (1/3 oz) Glass Bottles, with Glass Eye Droppers (https://www.amazon.com/gp/product/B079SHB9MS/) dropper bottles and they've worked well for me.
If any of you buy suppliments, piping rock has droppers and rollers, as well as essential oils for anyone whose mixing for themselves.
I've used these 2ml eye-dropper bottles. They don't seem to leak.
https://www.amazon.com/dp/B09VHBWLR4