1. Combine half the watermelon, half the water and half the sugar in a blender; puree. 2. Pour through a coarse strainer into a large container. 3. Repeat with the remaining watermelon, water and sugar. 4. Stir in lime juice. 5. Refrigerate until well chilled, about 4 hours. 6. To serve, stir in club soda (or seltzer) and garnish with lime. 7. MAKE AHEAD TIP: Prepare through Step 1, cover and refrigerate for up to 2 days. ---------------------------------------------------------------------------
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Ingredients