Second in The Order is Fire. In fact, it is closely related to the first priority of shelter because in many cases fire can be a form of shelter, especially if regulation of core body temperature is of immediate importance.
Fire is the tool of tools. Meaning, besides being a tool in and of itself, fire makes other tools possible. Besides warmth, fire can ward of insects and threatening animals, is a source of light - source of comfort igniting hope and resolving the will to carry on, it can be used to signal for help, cauterize wounds, and cook food; Looking at fire critically, fire can be used to process raw clay to make fire-proof earthenware vessels to aid in one of fire’s most important uses…water disinfection!