In that specific scenario I imagine we'd all die out fairl quick.
To begin with we'd all probably have a massive anxiety attack as a result of those events transpiring and gather in small groups all not knowing how to proceed. After the initial panic those groups might try to make a plan to survive but being that I'm not the most organised or conscientious person out there a few days in most if not all of us would say "fuck it, lets go out with a bang" and go crazy on food, booze or whatever we could get our hands on. We'd also probably start fucking each other because we're the only option.
Then we'd start dying either from misadventure, fighting over resources or just killing each other for the hell of it. I like to consider myself a peaceful and rational individual, but faced with this situation and no legal consequences? Pretty sure anybody would go nuts.
Once we get that out of our system the remaining few might try to band together to save things again. Even if we were able to come up with a serviceable plan by then it'd be too late. We wouldn't have enough resources to tide us over whilst we get on track as a society, if we even could. Then the final "mes" would die out as well.