Prepare all the ingredients and place in a blender jar. Add 2 cups water. Cover and blend until the mixture is very smooth.
Place a sieve over a pitcher. Pour the agua fresca through the strainer to remove the pulp. Add the remaining 2 cups water. Cover and chill until ready to serve.
Video
Notes
This non-alcoholic "mocktail" can be kicked up with vodka or tequila.