The Blue Lagoon mocktail is a refreshing, non-alcoholic drink featuring vibrant blue curaƧao syrup, tangy lemonade, and a splash of lemon-lime soda.
If you are using sprite or 7up, then that's fine but if using club soda, in that case you have to adjust with sweetness. Actually because cold drink comes with sweetness but the taste of club soda is bland. So you may need to add extra curacao or sugar syrup.