The lid on the bottle was a bit loose. But the drink was sitting there, and he was thirsty. So he drank it anyway.

It wasn’t a drink. It was urine.

Didi Chuxing confirmed that one of its drivers peed in a bottle -- the same bottle the hapless passenger in Shanghai took a swig from.

The man, whose last name is Sun, told Chinese media he found the bottle in question in a cup holder between him and the driver. It’s customary for Didi to offer free water in their Premier rides, but this particular bottle seemed to have been opened before.

When Sun asked about the loose lid, the driver pointed out that the bottle was filled to the brim, so it could be that the previous passenger opened it without drinking. Sun took a sip, and instantly spat it out.

“It didn’t taste right,” he said.

The alleged bottle of liquid gold -- and the driver, in the background, sipping his own bottle of water. (Picture: itouchtv.cn via Pear Video)

In a video taken in the immediate aftermath, the driver countered it was dark at night so he couldn’t see clearly. He repeatedly denied it was his urine in the bottle, even as Sun observed “it was still warm.”

Didi confirmed to us that the driver peed in the bottle because he couldn’t find a toilet -- and they are taking both Sun and the driver for physical checkups. The ride-hailing company added that there’s a toilet locator built into Didi’s driver app, used by more than 30,000 drivers everyday.

The driver has been suspended from service.

On social media, many are wondering why the passenger drank from the bottle in the first place.

“If the bottle was opened, I wouldn’t drink it at all. Even if it wasn’t urine, how would you know other people haven’t taken a sip?” said one popular comment.

“Couldn’t he smell it?” another asked.

Still, if you ever accidentally gulp down a small amount of pee, don’t panic.

Human urine consists mostly of water, with a small amount of metabolic waste. Dr. Andrew Yip, a Hong Kong-based urologist, told us that urine from healthy people are usually devoid of harmful microbes. In rare cases, urine from tuberculosis patients can contain bacteria. But all most likelihood, drinking pee shouldn’t be a problem -- unless you plan to consume more than a liter.

And if you do, well... that's a whole other issue.