This article discusses how to pit-fire pottery using wood for the heat source.
http://www.survivopedia.com/old-skills-revived-how-to-fire-pottery-outdoorsThis skill may become necessary if we lose electric power for whatever reasons.
There are a number of additional skill needed for success, such as finding and preparing clay and glazes.
The article gives links to more information and I advise following those links and adding the information to your prep library...