Hiking equipment
According to Tom Brown, the basic plan for survival is in the order of shelter (including clothing), water, fire, and food. Cody Lundin writes about the "Rule of 3s"; this relates to human survival without basics: three minutes without air, three hours without shelter, three days without water, or three weeks without food.
Inedia
In a television documentary produced by the Israeli television investigative show "The Real Face" (פנים אמיתיות) hosted by Amnon Levy, Israeli practitioner of Inedia Ray Maor (ריי מאור) who appeared to survive without food or water for eight days and eight nights. According to the documentary, he was restricted to a small villa and placed under constant video surveillance, with medical supervision that included daily blood testing. The documentary claimed Maor was in good spirits throughout the experiment, lost 17 lb after eight days, blood tests showed no change before, during or after the experiment, and Cardiologist Ilan Kitsis from Tel Aviv Sourasky Medical Center was "baffled."Hindu religious texts contain account of saints and hermits practicing what would be called inedia, breatharianism or Sustenance through Light in modern terms. In Valmiki's Ramayana, Book III, Canto VI, an account of anchorites and holy men is given, who flocked around Rama when he came to Śarabhanga's hermitage. These included, among others, the "...saints who live on rays which moon and daystar give" and "those ... whose food the wave of air supplies". In Canto XI of the same book a hermit named Māṇḍakarṇi is mentioned: "For he, great votarist, intent – On strictest rule his stern life spent – ... – Ten thousand years on air he fed..." (English quotations are from Ralph T. H. Griffith's translation).