I put a few drops of lime juice in mine to give it just a tad of flavor. Flushes your system, keeps you hydrated, and doesn't add anything bad to your body.
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I have an old, lovely lemon tree in my back yard, with fruit on it most of the year. That juice really makes water and other drinks spring to life!! I use Stevia and a touch of real sugar, the sugar mostly for feeding my Kombucha, which I also drink a lot of.