Combine water and agave in a small saucepan over medium heat until agave is dissolved and the mixture is lightly boiling.
Add cascara tea bags and cinnamon sticks and simmer covered for 20 minutes.
Take off heat and let steep for 10-15 more minutes.
Let mixture cool, remove tea bags and cinnamon sticks, and pour into storage container. Keeps for 6-8 weeks refrigerated.