mwa, sorry for the delay in responding. Been rather involved with family health issues the last few days.
+10 for Pete54s list. I've not done much experimenting on this aspect of storage. I do know that PG and VG, and actually nic itself, will leach plasticizers from some plastics. That is the taste you get if you taste plastic. Plastic itself has not taste. My personal experience is that early on in my vaping, I had some squeeze bottles of premixed juices which over time did take on a plastic taste, and I stopped using those bottles. I have not tasted any plastic at all with my 3, 6 and 10 mL squeeze bottles from USPlastics, never had any issues and I have used some bottles for years without noticeable change. These are all cloudy softer plastic, however, so if they are more cloudy now I could not say. They are LDPE and are designed to hold liquids far more reactive than e-juice without reaction or leaching.
That said, I do only store long term in amber glass (SpecialtyBottles.com). For daily usage, the soft squeeze bottles I get from USPlastics should be fine, since they are designed for biological and chemical storage.
Nalgene® Dropper Bottles | U.S. Plastic Corp.
I cannot speak to bottles from vendors, without knowing exactly their source for them. Chances are they are LDPE, it seems the ones I mentioned earlier were something else which delivered a distinct plastic taste. Not had that with the ones I use now, or any cracking or obvious morphological changes.
The clearos I first bought a year ago or so did crack eventually, and I do not use cinnamon or clove, both of which will kill hard plastic...and yes, I would call it etching, since if you grind cloves in a hard-plastic-lidded coffee grinder, the oils will render the smooth surface very cloudy. Both of those oils are very corrosive. So I would guess the clearos cracking would have happened a lot quicker with clove or cinnamon juices. Don't ask me what I think of people that vape that stuff. The kind response would be "you are playing with chemical fire, and you are a fool". But I will not sidetrack this important thread with that lung and membrane chemistry...google it.
Oh, and a rubber dropper bulb may over time dissolve with contact with VG or PG. I think this because we used to use EG in dropper bottles for lab lube, and those rubber bulbs would eventually dissolve from it, and VG and PG are not much different chemically.
