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Citrus water.
At 2 liters of water: the halves cut into circles 1 orange, 1 lime, 1 lemon. We put in a jar, a little warm up, to give fruit juice, but have not turned to mush. Fill the jar with ice, top up with water up to the edge. Gently stir with a spoon handle. Close the lid, put in the refrigerator or just a cool place.
You can drink at once, but the flavor becomes more complete in 1-2 hours, and even more full flavor of the drink will acquire a day. Even until the next day the ice may melt completely and will not serve as a sieve which separates the water from the pieces of fruit.