This was taken directly from the article you quoted though.
"When exercising, you should be pounding down water on an even more disciplined schedule. Since the human body can only absorb so much water at one time, the rate of ingestion should be matched, as closely as possible, to the rate of absorption. Most of us have been classified for years into a rate-of-absorption range of one-quarter liter per one-quarter hour. Recent research indicated some of us can do better, absorbing as much as one-quarter liter in 10 minutes. That means, for maximum efficiency and well-being, drink about one-quarter liter of water every 10 to 15 minutes during periods of exercise. And cool water gets absorbed faster than warm water. In some conditions you will lose water faster than you can replace it. In those conditions, rest breaks, during which fluid is consumed, become important."
Which again goes back to the saying where the body can only absorb about 1 liter per hour. While some may do better its a pretty safe bet. Ever pound a liter of water and then feel a little sick after?