Steep the passionfruit tea bags in boiling water for 5 minutes. Remove and discard the tea bags. Allow the tea to cool completely (I let it sit at room temperature for about 30 minutes then chill in the refrigerator for another 30 minutes or so).
Add the cooled tea, watermelon juice, and lime juice to a pitcher. Stir to combine.
Chill in the refrigerator for at least 30 minutes, or until ready to serve. Serve over ice.