Prepare the butterfly pea flower tea: In a medium saucepan, bring 2 cups of water to just below boiling point (around 175°F/80°C).Remove from heat, add the dried butterfly pea flowers or tea bags, and let steep for 5-7 minutes until the water turns a deep blue color.
Strain the tea through a fine-mesh strainer into a heat-proof container or pitcher. Allow to cool completely at room temperature, then refrigerate until chilled (about 1 hour).
Make the honey simple syrup: In a small saucepan, combine the remaining 2 cups of water with honey or agave nectar. Heat gently while stirring until the sweetener completely dissolves. Remove from heat and let cool to room temperature.
Prepare your serving glasses by filling them halfway with ice cubes. Pour approximately 1/4 cup of the blue butterfly pea flower tea into each glass.
Add 2 tablespoons of the honey simple syrup to each glass and gently stir. The drink should maintain its beautiful blue color at this stage.
If using coconut water, add 1/4 cup to each glass and stir gently. This adds a subtle tropical note and natural electrolytes to your mocktail.
For the magical color-changing effect, serve the lemon and lime juices in small separate containers alongside each drink. When ready to enjoy, have everyone pour about 1 tablespoon of citrus juice into their glass and watch the transformation from blue to purple!
Garnish each glass with a sprig of fresh mint and a wheel of lemon or lime. For a sparkling version, top with a splash of sparkling water just before serving.