Use your hands to crush the basil until its juices are released.
Add the basil, orange zest, and hot water to the mason jar. You don't want the water to be boiling, just hot enough to pull the flavors from the fresh ingredients.
Cover the jar with a lid and let steep for 10-15 minutes or until cool.
Strain and add the orange juice.
Let the mixture cool completely in the fridge and mix with sparkling mineral water right before serving.
Notes
Instead of orange, try grapefruit, tangerine, or clementine instead.