Chirp is a line of zero calorie sparkling water drinks that are enhanced with L-theanine and 50 mg of caffeine from white tea. The product, which was announced in April, is available at Target. The lineup includes five flavors: Blackberry, Golden Mango, Pink Grapefruit, Black Cherry (which we did not sample) and Watermelon, all of which use natural flavors and have no sweetener added.
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