Here is how I made my own at home (very easy):
Let the tea steep a few minutes, you want the tea flavor strong.
Add some honey (about a spoonful), 1/2 tsp vanilla extract, and a shake of cinnamon and nutmeg.
Top it off with your favorite milk product: 2%, whole, half-n-half, cream.
Its that easy! I don't know if its right, I was going mostly on taste, but it tasted pretty good. I would make it again and maybe experiment a bit more. I feel like I am missing a chocolate factor, but I can't put my finger on it.