My favorite diet soda by a mile, sweetened only with stevia and they a ton of great flavors.
With a few flavors Vitamin Water Zero is a solid keto-friendly choice when you want something a little tastier than water. Sweetened with erythrtiol and Stevia.
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Disclaimer: I am not a doctor. Please consult a medical professional before making any medical decisions. These are my personal opinions based on years of practicing the ketogenic diet.