I use polyethylene plastic dropper bottles, like most. No plasticizers in that, but not good for long term due to O2 diffusion through the walls. Those are the cloudy plastic bottles. Perfectly clear plastic is usually polycarbonate, and that has plasticizers. Not a fan of glass droppers, but many like them. I make fresh often enough that its fine. For the glass, if it is in a dark freezer, any color will do, and I have a few colorless glass bottles too...the nic in those is fine. The light issue is mainly for UV/sunlight. Visible light doesn't do much. I think your plan of several 30 mL bottles and some larger ones for very long term storage is quite good. I do this too...had to with a recent WL nic I got, since I ran out of my 50 mL bottles, so into a 500 mL bottle it went, and it is in the freezer now for when I need it...in 2020 lol!
