Puree cantaloupe or watermelon in a food processor and pour through a fine sieve to eliminate pulp. In a pitcher, mix strained fruit puree with water and add sugar, lime juice, and salt, to taste.

Chef's Note: This and other similar fruit drinks, which translate literally as "fresh water," are served all over Mexico and they're a cinch to replicate at home. The key is to strain the pulpy fruit to make a clearer liquid. Instead of melon, you could use strawberries, pineapple, mango, or any fruit that is soft enough to puree.