Need a cool summer drink? Agua frescas are the answer. These fruit waters are popular in Central America and Mexico. You've seen them in some Mexican restaurants or sold by street cart vendors along Florin Road. They are usually in big barrel-like jars. They make many different flavors, but the easiest is the watermelon one.
I cut up a seedless watermelon and put it in a large pitcher. I then take my handheld blender to it and quickly liquefy it. Watermelon is so much water and hardly anything else. Some people will strain it, but to me it's fine the way it is. Now add about a third as much cold water. (That would be 2/3 watermelon juice to 1/3 water.) This is the way I like it, but many like it even more diluted. Now squeeze the juice from either 1-2 lemons or limes. If you feel it needs it, you can add a 1/2 cup of sugar. Delicious and refreshing. You can also add some chopped up mint in there as well if you like. Serve well chilled or over ice.