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Multiple brands now offer quick mixes in individual packets that can be added to a bottle of water. Some water purifiers that can be attached directly to a home water faucet also offer flavor options. Only add the recommended amount (or less) to avoid overloading on sugar and other additive ingredients. Some pocket-sized flavor additives offer color and flavor to water without adding calories or other unhealthy ingredients.
Buy zero-calorie packets of powdered tea or juice-flavored additives. Consider a water tap purifier and flavor pack. Look into purchasing a hand-held flavor booster.