Place the watermelon and 1 1/2 cups of cold water in a blender.
Blend until smooth, then strain through a mesh strainer into a pitcher.
Stir in the remaining water, lime juice, and agave.
Serve chilled over ice, and enjoy! You can also garnish your glasses with lime slices.
Notes
Ripe watermelon has a dark matte color, feels heavy, and sounds hollow when tapped. It also has a large yellow splotch at the bottom.
Take this watermelon agua fresca to the next level with a pinch of coarse sea salt. The contrasting flavor will help bring out the flavor of the refreshing sipper!
You can store your leftover watermelon aqua fresca in a covered container in the fridge for up to 2 days. You can also freeze this delicious drink for up to 3 months. Thaw before serving, or enjoy it like a sorbet!