Few drinks offer as refreshing and delicious a way to quench your thirst on a summer day as a cold agua fresca. The nonalcoholic drinks, rooted in Mexico — agua fresca is Spanish for “fresh water” — are typically made with puréed fruit. Traditionally the ingredients are ground by hand, but these days, most people opt to use a blender. Fruit options are almost limitless. (Some aguas frescas, including horchata, use grains, such as rice.) If you can find it at your grocery store or farmers market, you’re in business: watermelon, cantaloupe, honeydews, strawberries, tamarind, peaches, pineapples, mango, papaya and cucumbers are popular choices. While these drinks are wonderful right out of the blender, making them a few hours in advance allows the flavors to intensify and th...