Warren Buffett hasn't had a drink of water in 50 years. At least, that's what he told Bill Ackman.

Warren Buffett is a longtime fan of Cherry Coke. Daniel Acker/Bloomberg via Getty Images

Warren Buffett hasn't had a glass of water since at least the 1970s.

That's what the 96-year-old business icon once told Bill Ackman, the billionaire hedge fund manager recalled during an episode of the Equity Mates Investing podcast that aired this week.

Ackman said that Buffett came over for dinner at his home "years ago," and he'd made sure to stock up on the legendary investor's favorite drink, Cherry Coke .

The Pershing Square founder and CEO said that once they were sitting at the table, he asked Buffett whether he'd like still or sparkling water. Buffett politely declined, opting for his preferred soda instead.

"But I said, you know, 'Don't you drink water?'" Ackman recalled.…