Make a simple syrup: In small saucepan, bring sugar and 2/3 cup of water to boil and simmer until sugar is fully dissolved. For herb-infused syrup, add your choice of herb before boiling. Strain herbs from syrup, if used, and allow to cool.
Combine syrup with Meyer lemon juice and cold water in large pitcher and stir until well mixed. Serve over ice with garnish.