1 cup sugar
4 cups water, divided
In a small saucepan, heat 1 cup of water with sugar, stirring until sugar is dissolved.
Combine sugar-water, lime juice and the rest of the water in a large pitcher. Feel free to add in some more sugar if you like your limeade sweeter, or a bit more water to tone down the zestiness if you have limes that are on the sour side. Add ice to help cool down the limeade, then chill until ready to serve.