One look at this Bruce Willis vodka ad and you know Willis is just pocketing a check and probably hasn’t the slightest interest in sipping Sobieski vodka. Which is why this photo of Smart Water pitchwoman Jennifer Aniston is impressive. She’s off in some Caribbean hideaway and drinking the stuff with no assumption that anyone’s looking. Her ad-deal payment probably included a provision that she’d be supplied with cases of Smart Water for life, but still…