In the Dark Tower series written by Stephen King, a man known as the gunslinger walks thirstily through a desert on page 1. When I read this, I knew this form of self discipline was meant for me and have now been using it over 10 years.
The gunslinger walked stolidly, not hurrying, not loafing. A hide waterbag was slung around his middle like a bloated sausage. It was almost full. He had progressed through the khef over many years, and had reached the fifth level. At the seventh or eighth, he would not have been thirsty; he could have watched own body dehydrate with clinical, detached attention, watering its crevices and dark inner hollows only when his logic told him it must be done. He was not seventh or eighth. He was fifth. So he was thirsty, although he had no particular urge to drink. In a vague way, all this pleased him. It was romantic.