All kidding aside , I have friends that up until recently just before one died used draft horses to plow fields , grade roads, you ever seen a horse or ox drawn road grader ? darn things work just takes longer. They pull trailers mostly using big old Percheron's. Their livestock and fowl make plenty of fertilizer , these folks grow plenty of feed, plenty of food and it's not because they have to use the old ways, it's because they like to. Their water wells are pretty high volume, we have year round springs in the area and if you were willing to work you can build cisterns, water catchments, drill or dig a ground water well, build a wind mill. The only thing you really need is water, some type of shelter and a means to either grow or hunt for food and the ability for defense to survive. Bartering and old school the way the old timers did things is a good thing, learn how to can and preserve food. look at the way we are going today it's a throw away world, can't fix it just buy a new one. I look at what my folks did during the depression they used everything , they ate everything, animal parts that most people wouldn't eat today, they grew what they needed and more, they raised all sorts of livestock and chickens, they fed other people, they used horse drawn combines and they did pretty good for what they had.