Place lemon juice, sugar, coconut water, and water into a pitcher and shake or stir vigorously until all the sugar is dissolved. I prefer to shake because it aerates the lemonade and makes a nice head on top.
Pour 1/2 of the lavender syrup into the pitcher and stir. You can add more or less lavender syrup to your personal taste. I personally find that 1/2 of the lavender syrup recipe is a good balance.