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At Rambler, we set out to build a truly responsible water company. That starts by using only sustainable sources and making them better through a sincere focus on quality filtration techniques. But our commitment to conservation can’t stop there. It’s why we partner with programs like American Rivers and Texas Parks & Wildlife Foundation at the local level across the country to help preserve natural areas in our backyard and yours. Our proprietary Texas limestone filtration process balanced with the perfect level of carbonation results in a complex flavor you can’t put your finger on but keep coming back to. ABOUT OUR WATER We’re committed to using only sustainable sources, which is why we created a proprietary Texas limestone filtration system that allows us to impart our signature taste consistently at scale in Texas and beyond, instead of depleting sensitive water sources. Low on energy? We gotchu. Rambler Sparkling Energy is an all-natural Sparkling Texas Yaupon Tea, sourced from CatSpring Yaupon in South Texas. Featuring 75mg of plant-based caffeine, 5 calories per 16 oz. can and zero sugar. Zilch.