Plain water remains the best everyday choice for most people, while functional waters, such as electrolyte, alkaline, vitamin-enriched, or herbal-infused options, can help in specific situations like intense exercise, heavy sweating, heat, or illness. Check labels for added sugar, caffeine, and actual ingredient amounts. Electrolyte drinks replace lost minerals, alkaline, vitamin, and herbal waters have mixed evidence, so prioritize food and evidence based products.
