A SAN Francisco 49ers fan has received a nasty surprise after swiping Tom Brady's water bottle.

The football fan tried out what was inside the 45-year-old icon's bottle - and it's fair to say he didn't like it.

Brady's Tampa Bay Buccaneers team were hammered 35-7 by the San Francisco 49ers on Sunday.

The quarterback made a quick exit after the massive defeat at Levi's Stadium.

And one fan sitting by the side of the field got his hands on a Gatorade bottle that Brady drank from.

TikTok user @Trent..h shared a video of himself drinking from Brady's bottle.

He wrote: "Swiped Tom Brady's water bottle."

And Trent added: "That Brady juice tastes horrible."

It wasn't clear what was in the bottle, but it's fair to say Trent didn't enjoy it.

Brady has stayed in shape with a strange diet that includes adding electrolytes to water.

He's also been known to feast on avocado ice creams as his treat.

Brady had a miserable California homecoming as his Bucs were thrashed by the 49ers.

His defeat was so bad that FOX Sports even switched off the game and took viewers elsewhere during the third quarter.

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