These cool drinks are made with water, fruit and a sweetener (typically sugar) and are commonly served in Mexico by street vendors in barrel shaped clear jars called a vitrolero
You will also find them in many Mexican takeout restaurants. Aguas frescas are the drink of choice in most Mexican cantinas.

I N S T R U C T I O N S
To make just take any ripe fruit (common flavors include pineapple, cantaloupe, honeydew, watermelon, strawberry and papaya) blend till smooth, add water to thin to a light consistency and sweeten to taste with sugar. Depending on the fruit you may need to strain the mixture to remove any seeds or small bits, the drinks should be the consistency of water (thus the name).