Rinse and dry the cucumber. Slice it thinly, crosswise, into ⅛-inch slices.
Rinse and dry the lime. Slice it thinly, crosswise, into ⅛-inch slices. Rinse and dry the mint sprigs.
Place the cucumber slices, lime slices, and mint sprigs in a 1-quart water pitcher.
Pour the water on top. Use a chopstick or the handle of a wooden spoon to gently stir.
Cover and refrigerate for one hour. Serve with ice, if desired.
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Notes
This recipe doesn't contain significant amounts of calories, carbohydrates, protein, or fat. The nutrition info below is based on nutritionix.com.
This beverage tastes best when it's chilled, so I wouldn't skip the step of chilling it. However, if you use chilled water in the recipe, you could let the flavors meld for about 20 minutes rather than a full hour.
You can keep the water in the pitcher, covered and refrigerated, for up to two days.