Find a sumac bush with ripe deep red to maroon berries.
Cut off as many bunches of berry clusters as you need. Generally four to six clusters per gallon of water is good. Don't try to pick the individual berries, just cut the stem at the base of a cluster.
Pick off any visible bugs. Don't rinse the clusters as this can remove some of the nutrients.
Add the berry clusters to a large dispenser or pitcher.
Add cool water to pitcher.
Cover and soak for 24 hours.
Strain the tea through cheese cloth or a coffee filter into another jar.
Add sweetener such as powdered stevia that will dissolve in the cool tea.
Notes
Some people slightly crush the berries before soaking to speed up the process but I didn't do that.The longer you soak, the stronger the tea will be. You could also set the pitcher outside in the sun to make a sun-infused tea. I used a coffee filter securely attached to the jar with a rubber band to filter out any debris from the finished tea. You can gently heat the finished tea and add a liquid sweetener such as honey.