Juice the citrus, and strain out any seeds or pulp. Set aside.

In a small saucepan, combine sugar and water, simmer on very low heat until the sugar has completely disolved.

Allow the simple syrup to cool completely. Combine the citrus and syrup in a large mason jar, screw on a lid, and shake very well.

You can divide into smaller mason jars, or leave in the large mason jar. Refrigerate for up to 3 weeks.