Add the juice of the 5 lemons to your blender, along with the honey, fresh blueberries, and one cup of the water (do not add sparkling water to the blender!).
Blend on high speed until smooth.
Strain and pour into a pitcher, along with the rest of the water. Stir well.
Top off with ice, a few fresh blueberries and lemon slices, and some sparkling water (if desired).
Notes
Make-Ahead and Storage Instructions
This recipe can be made up to 2 days ahead of time and stored in the fridge until ready to serve.