Life in a Medieval Castle by Frances and Joseph Gies is an outstanding read for any survivalist who wants a better understanding of how people survived the medieval ages. The book covers peasant life from around the 1100s to what happens after the Black Death of 1348 and 1350.
Just about every detail of daily life is described; such as what crops were raised, what farm animals were raised, what uses the animals served, what services the animals preformed, which animals were best for butchering, which ones were not butchered, what people ate, and the difficulties that people ran into.
One example is that crop fields slowly turned into sheep fields. Sheep served several purposes – meat, milk, wool and skin for writing. People could make more money by raising sheep and exporting their wool, then could be made from growing food crops.