Good thread, Sthrn. I'm sure a lot, if not most of us, have thought about this.
I have never jumped on the doomsday prepper bandwagon, myself. However, that doesn't mean I don't believe in being more self sufficient. As far as vaping goes, being a tobacco lover, I've been improving my NET extraction methods. My last attempt yielded some very tasty liquid. I figure tobacco & Everclear will still be available, and other than some warming equipment (aka crockpot), and some filtering methods, the only other thing needed is patience.
As bradslinux pointed out, it seems like the fly in the ointment is going to be nicotine. I've been slowly reducing the nic in my mixes. I started out at .12 mg, when I started vaping, and I''m presently down to .4. I want to do a nicotine test on my NET liquids, just to see where it might be. I'm sure it's pretty low. I read somewhere that most NET extractions top out at .1 to .2, but I don't know how true that is. Maybe I wont need to add much nic, if I'm lucky.
I do want to acquire more hardware. I only have a few tanks, and I find the Kanger Subtank Mini to be pretty versitile, with the RBA. I may stock up on some more of them, and a few spare RBAs, and other spare parts for them. My way of thinking is, having the ability to repair and rebuild just makes sense, if that part of the hardware equation becomes banned or scarce. That's just my way of thinking.
I might stock up on some of my favorite commercial tobacco flavorings as well. While the flavorings for fruits, desserts, etc should still be available for normal cooking, I'm not sure if the same will apply for tobacco flavorings.
Looking forward to reading the comments of others.