Wash the ginger and cinnamon thoroughly to prepare.
Add water, ginger, and cinnamon to a pot and bring to a boil.
Simmer on medium heat for about 30-40 minutes to infuse.
Turn off the heat, remove the tea bag, and let it cool.
Add zero-calorie sweetener such as erythritol and stir well.
Store in the refrigerator and serve chilled in a cup.