He pretty obviously added alcohol to the coffee Chantal didn't like, and they both drank out of it. So he's carrying alcohol around with him. Classy.
She was asking him a question about the coffee then abruptly stops and says, "No, no" to him and does shifty eyes at a passerby. He shushes her. Then she says, "Did you mix it? Hahahahahahaha." She makes this face:
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Then says "That's a good idea. Let's see" and takes a sip. He mutters something, possibly saying "booze," possibly saying "now both good". She then says, again, "That's better. That's a good idea, actually. Cheers!" More shifty eyes at passersby and giggling.
As if her driving could stand to get any worse, apparently he's now taken to carrying alcohol around with him and adding it to drinks on their excursions.
They take turns drinking both drinks in the car.
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