Rambler, an independent sparkling water company, unveiled its Rambler Yaupon Energy, an all-natural energy drink with yaupon, a native caffeinated plant in North America. Combined with Rambler’s signature limestone mineral blend and crisp carbonation, the sparkling, all natural, plant-based boost contains no artificial ingredients or sweeteners, it says. Rambler Yaupon Energy is available in four flavors: Pomegranate, Peach, Blackberry Mint and Lime Coconut. Rambler Yaupon Energy delivers 120 mg of clean caffeine and is low in calories with zero sodium, the company notes. The line currently is available at Whole Foods Markets in the Southwest, Central Markets throughout Texas, and Giant Landover in the Northeast, as well as online at Amazon.com.