Four sheep (1 male, 3 female) and a covered wagon, like this guy. Without something like Bitcoin, you're gonna become poor like everyone else, so you might as well have a food supply. Three female sheep can produce more milk/cheese than a single person can consume, so you can trade some of your dairy product for other stuff (eggs, beef, clothes, tools, etc). That lifestyle wouldn't be easy for most people, but hardship is better than starvation.