Wash Watermelon (1) thoroughly, peel, and remove any seeds.
Cut watermelon into cubes and add Honey (3 tablespoon) and the juice of Lime (2) to a blender.
Blend until very smooth. Strain through a fine mesh strainer.
If you like to add ice to your drink, freeze some of the Agua Fresca in an ice cube tray, so when it melts in your drink, it adds juice, not water.