Combine the water, sugar, and lemon juice and mix until the sugar is fully dissolved.
Pour over ice and serve with a lemon slice (optional).
Recipe Tips
You can add 1/2 teaspoon of lemon oil to this recipe for added flavor. If you add lemon oil, reduce the lemon juice to 1/4 cup.
This recipe works best with freshly squeezed lemon juice, as opposed to store-bought lemon juice.