Using a funnel, pour freshly made homemade kombucha into 4 (25 ounce) bottles with flip top lids or other air tight bottles.
Pour ¼ cup pumpkin purée, ½ teaspoon pumpkin pie spice, and ¼ cup maple syrup into each 25 ounce bottle leaving 1-2" head space.
Let bottles sit out (at 75° - 85°) 3-5 days, making sure to pop the lids each day to let out the pressure of the carbon dioxide. Taste each day to test its flavor and fizziness.
Refrigerate when you are happy with the amount of fizz and flavor.