DESIGNER DRINKS: Beach, sleep, eat, drink, delete — fashion week rehab varies from one person to the next. Over at Peter Som’s offices, the designer will be leading staffers in a three-day Cooler Cleanse detox. As part of its NYFW Get Juiced campaign, Juice Generation helped keep Som and his team running last week with its Supa Dupa Greens juice. Apparently green’s popularity wasn’t just on the runway. Chris Benz went with Essential Greens, Alexander Wang Inc. was all about Mr. Greengenes and Shoshanna Gruss opted for Hail to Kale. While his spring collection was mostly black and white, Yigal Azrouël’s juice of choice last week was considerably brighter — Mucho Mango with Ginger.