In his book Sahara Unveiled, William Langewiesche tells the story of an Algerian named Lag Lag and a companion whose truck broke down while crossing the desert:

They nearly died of thirst during the three weeks they waited before being rescued. As their bodies dehydrated, they became willing to drink anything in hopes of quenching their terrible thirst. The sun forced them into the shade under the truck, where they dug a shallow trench. Day after day they lay there. They had food, but did not eat, fearing it would magnify their thirst. Dehydration, not starvation, kills wanderers in the desert, and thirst is the most terrible of all human sufferings.

Physiologists use Greek-based words to describe stages of human thirst. For example, the Sahara is dipsogenic, meaning "thirst provoking."

In Lag Lag's case, they might say he progressed from eudipsia, "ordinary thirst," through bouts of hyperdipsia, meaning "temporary intense thirst," to polydipsia, "sustained excessive thirst." Polydipsia means the kind of thirst that drives one to drink anything. There are specialized terms for such behavior, including uriposia, the drinking of urine, and hemoposia, the drinking of blood.

For word enthusiasts, this is heady stuff. Nevertheless, the lexicon has not kept up with technology. I have tried, and cannot coin a suitable word for the drinking of rusty radiator water. Radiator water is what Lag Lag and his assistant started into when good drinking water was gone. In order to survive, they were willing to drink, in effect, poison.

Many people do something similar in the spiritual realm. They depend on things like money, sex, and power to quench spiritual thirst. Unfortunately, such "thirst quenchers" are in reality spiritual poison, a dangerous substitute for the "living water" Jesus promised.