I get the majority of my caffeine from Ito En Sencha Shot. Canned japanese green tea, unsweetened and vitamin c is the only preservative. I much prefer chill

I get the majority of my caffeine from Ito En Sencha Shot. Canned japanese green tea, unsweetened and vitamin c is the only preservative. I much prefer chilled green tea, but am too lazy to make it all of the time - works great for me.