Not to hi-jack the thread from the value of Alcohol (it is valuable now and will continue to be), but I wanted to chime in on the SHTF scenario.
So many scenarios listed here are possible, some even probable. There are only a few that could come any moment and we would have no warning, and of those, most would not be a long term issue.
The one that could come with no warning, change everything for ever, and we have no evidence to suggest how likely or unlikely it is, is the old classic that no one on "Doomsday Preppers" ever mentions, and its more scary than zombies.
Aliens.
It is nearly a mathimatic impossibility that there is NOT intelligent life out there. In fact, it is likely there are COUNTLESS intelligent races.
Many of you may say, "if an alien race has the technology to get here, there is no "prepping" that can be done. They will simply scrape us off this planet with their boot heel and be done with it."
That is a distinct possibility. But, we have numerous examples in Earth's history where a vastly superior invader did NOT completely wipe out the native population.
One great thing about prepping is that alot of the work you do for one SHTF scenario will be helpful for a different one, so whatever gets you going is the one for which to prepare. But about everytime I stop to think, "well, the dollar could pull through" or "I am 600 miles form a major faultline" or "I live in a rural area"...I remember that hostiles from Zeta Reticuli could be popping into our solar La Grange as we speak.
Maybe they have have The Death Star, or maybe they are just Force Recon wanting to see how resilient we are. Can they just roll us into the sea, or will we get our "guerilla on". If they have the Death Star, then prepping isn't much good unless you are building a space raft. But if they have a media like we do...then if we make it nasty enough, maybe we survive.
Cheers!