Hardtack is a dense bread that has minimal water and can last months without modern refrigeration. It is true to its name and has a reputation for being hard as brick. Historically, it has helped armies and sailors make long trips by packing wooden casks with this hard bread.
Making it is simple and it requires only whole wheat flour, salt and water.
Put the hardtack on a un-greased pan and bake at 375 for 30 min. flip and bake for another 30 min.They will keep for a year or longer if stored air tight.