Hi GatorzGirl! The condiment bottle is 16 ozs, so a bottle filled with my base will last for about 16 weeks. I just keep the condiment bottle filled with the base in a cupboard (away from heat and light) and it's fine. As far as I can tell, the taste does not change over that period of time, nor does it develop any color or odor.I got my bottles at WalMart, too. They are so convenient! I don't keep my nic in one, tho. Does it hold up ok? I only have a 125ml bottle right now,and it's in the drawer. Does freezing it change the consistency or quality?
I bought my label maker years ago. Apparently they aren't made anymore. Brother P-Touch PT-2700 But I love it!
FWIW, When I do make up my mixes, I put the date on a separate label. That way, when I refill the bottle, I don't have to make a whole new label. (I don't know how to post pics here, sorry.)
I'm still hunting for "just the right method" for storage.
Is it best to keep the flavoring bottles in the dark? I do have a small box that I keep steeping bottles in, but I'm not sure what's best for flavorings. I know at the vape shops they keep the mixed bottles out in view, so, maybe it doesn't matter?
Too bad you're not closer. Hubby and I are carpenters.
I've been using a crystal clear nic with no odor for quite a while now, but I have bought nic in the past that came with some normal nic odor and slightly yellow color. It's alright - it just has an extra taste that is a bit peppery.
Take your nic out of the drawer and store it in the freezer to keep it fresh longer. Freezing will not hurt it. It depends on how fast you use it up, so if you will use it up fairly quickly, keeping it in the dark might be enough. I now keep my 100mg/ml VG nic in the freezer. It does not freeze, but boy does it get thick (I think I will order a PG nic next time) - so when I'm going to mix a batch of base, I'll take it out of the freezer and let it sit in room temperature for a while in the cupboard so it doesn't get exposed to light (probably doesn't matter that much as long as it's not baking in the sun). When I last bought nic, it was the first time I bought a 240 ml bottle of 100mg/ml (previously I bought 120 ml bottles, one at a time). Since I knew it would take quite a while for me to use 240 mls, I chose to store it in the freezer. Before that, I had just kept the smaller bottle in the fridge, so I didn't really need to warm it up to use it. Keeping nicotine in the dark will help preserve it, as well as keeping it cold. Light, heat and oxygen will affect it and make nicotine get darker and also change the taste which is not good, although some have reported e-liquid (depending on the flavor) that has aged for many months actually tastes better than when new, even though it has turned dark brown. That has never been my experience - whenever I've found an old bottle of e-liquid that has turned really dark, the taste has been awful. I'm sure the quality of the nicotine affects this effect too. Since exposure to air affects the nic, it's good to get the cap back on its bottle as quickly as you can.
It's best to keep flavoring bottles in the dark, away from heat and light. Some flavorings may crystallize a bit if kept in the fridge, but it shouldn't hurt them. If it happens, warming it up should dissolve the crystals. I've never felt the need to keep flavorings in the fridge - kind of like before I was vaping and I never kept vanilla or almond liquid flavoring used for baking in the fridge. A big bottle of vanilla stays in my cupboard lasting for a few years at a time and it never went bad. That stuff usually has enough alcohol in it to probably preserve it indefinitely. I would think that any flavorings with PG as a carrier would behave similarly since it is a type of alcohol.
As far as the vape shops keeping liquids out and on display, my guess is that they are not sitting there very long because customers buy them - so a vape shop's stuff isn't going to hang around nearly as long as our stuff does in our homes. If something has dust on it, then I would wonder if it's too old. I would also look for "born on" dates.
Your idea to have separate labels for the name and date is a really good idea. I just write the flavor of my mix on a label for the bottle and make notes on the wall calendar in my kitchen and more extensive notes (like when developing a new recipe) in a notebook. After finally finding two "sweet spot" vapes and getting the recipes tweaked, I haven't felt the need to do much mixing, except for keeping those two flavors made. But now, I just had to get in the mood to find some more flavors to vape, and now there are flavoring bottles scattered all over my kitchen counter.
The flavorings cupboard is kind of on hold until I get my computer fixed or replaced. I think I have spent enough hours on the phone with tech support and finally made some progress yesterday. My printer that served me well for over 7 years probably needs replaced too. Researching computers and printers to buy is so time consuming.
It would be nice to be friends with some vapers in person, especially ones with carpentry skills and equipment and the work space for it.
As for the tiny bottles, I thought about corralling them in shallow little boxes of some kind, or maybe there is a way to make some kind of dividers that could be moved. Maybe cutting some black foam core in pieces that would fit tight enough in the rack? I've also seen plastic corrugated cardboard. It came in different colors and I bought some bright blue to make a sign once. I think I got it at a store like Michael's. There are also those clear plastic disposable containers that certain foods come in from the grocery store - the kind that are boxes with hinged lids. Those could be cut down to fit and the plastic would be flat. I don't think they would "junk up" the look. It would be nice to have movable dividers just help organize categories. I'd love to see your vintage sewing box. I sew and the antique sewing paraphernalia is really something. Those vintage accordion sewing boxes look much nicer than big accordion tackle boxes (although they are great for organizing stuff too). 
I'm having a little trouble handling life in general right now and having a tendency to get lost in all the details is not helping.
Flavor storage racks are on hold for now 
