1Cut the watermelon into small cubes and remove any seeds.
Peel the orange, remove any seeds, and separate into segments.
Add the watermelon cubes, orange segments, lemon juice, and sugar into a blender.
Pour in the water.
Blend all the ingredients until smooth.
Strain the mixture through a fine mesh sieve to remove pulp, if desired.
Pour the cooler into glasses over ice and serve immediately. Enjoy your refreshing Watermelon Citrus Cooler!