Survival skills
A human being can survive an average of three to five days without the intake of water. The issues presented by the need for water dictate that unnecessary water loss by perspiration be avoided in survival situations. The need for water increases with exercise.
Béla Bicsérdy
In the 1920s, Bicsérdy inspired a great many people in Transylvania and Hungary promoting a regime of a raw vegan diet (mostly fruits with some bread and raw milk), regular fasting, sunbathing, daily outdoor exercising and regular water-cure. He claimed that any person who followed his regime will be cured of illness and will live hundreds of years, just as known possible from ancient times (the Bible for example reported many long-lived people).