If you want a kick with your green tea (high caffeine) I would check out Zest Tea.

I found it on Amazon a while back:

https://www.amazon.com/dp/B01138VKMY/ref=cm_sw_r_cp_apa_i_e3lzCbQJGVT0A

I drink it in the morning during my fast. I alternate, morning to morning, between their green and black tea.