This is from one of Diana Kennedy's books.
You scoop out the seeds and goo from the center of a cantaloupe melon and put it in your blender jar. Add three spoonfuls of sugar (or honey, or agave syrup, I would think), juice of a small lime and fill with water. Blend. Rest in fridge overnight and then blend again. Strain and drink.
I love these something-for-nothing types of recipes.