Add 1 cup of water along with the remaining spiced pani ingredients to a blender and blend until smooth.
Then add the remaining 4 cups of water and blend.
Refrigerate the pani for 2-3 hours, or until chilled. Strain the water into a pitcher before serving. You can make this water and keep it in the fridge for 1-2 days ahead of time.
To assemble pani puri: tap the center of the puri to make a small hole, then stuff the puri with potatoes and chickpeas, and pour the water inside to fill up the puri, then put the whole thing in your mouth and enjoy!