Water more deadly than fluoride

The recent death in the US from a college initiation prank was a tragic waste of a human life. In order to fit in with the group, the 21 year old student was subjected to a quiz, where the penalty for getting the answer wrong was to drink large amounts of water and exercise.

The student is suspected to have died from a hyponatremia. The high amount of liquids, dilute the level of essential electrolytes in the body causing organ failure. Excess fluid consumption can also cause the brain to swell, which can also cause death.

In the recent case, the exact amount of liquid consumed is not known. There were 2 people involved and the 114 litres (30 gallons) water was doused on them as well as consumed. With this information, it is likely that less than 20 litres was consumed.

With the recent anti-fluoride debate in the Queensland media, I'm left wondering. If 20 litres is enough water to cause death, then how is a 75kg individual supposed to consume the 69,975 litres of fluoridated water required to ingest a lethal dose of fluoride?

"There is only one truth. How we interpret that truth is called belief."
"The existence of belief does not indicate the prescence of truth"