Well, you can tweak it to suit your taste. Essentially it's a spice mix so if you don't like too much of a certain spice, you can add less. That said, you'll either need to make tea bags or use a strainer and a teapot.
But here's a tip for you that I literally learned a few days ago. Like you, I need as little caffeine as possible. Apparently, if you take a regular tea bag, poor the hot water on it, steep for 30 seconds, take the bag out and throw out water and THEN add water and steep again, you are losing over 70% of the caffeine.