If you decide to
buy nic in bulk, I like these bottles with eurodropper inserts for syringe dispensing and spill-protection, plus the inserts act as a gasket similar to a polycone cap.
Essential Oil Amber Dropper Bottles | Specialty Bottle
Also available in blue and green glass. Prices are comparable to the Glass Bottle Outlet. Leave a few mL of headspace in the bottle for freezer storage. I've never had a break in the freezer, but putting the bottle in a ziplock freezer baggie is not a bad idea, nor is a bit of padding like a paper towel or bubble wrap if you are concerned.
You might be interested in my Sticky on this:
Long Term Nic Storage
Depending on how much room you have and how much you
buy, you may want larger bottles for most of the nic, and smaller for dispensing from. Most of my storage bottles are 50 mL (2 oz), also for dispensing for daily use, with larger ones for bulk storage.
Been doing it this way for almost 7 years, and my liquids are as fresh as the day I put them in the freezer, many more than 6 years old now. Same for many others here. I expect many years of virtually 100% preservation doing this.