I know: "It ain't 'Scripture'"
7 And, again, strong drinks are not for the belly, but for the washing of your bodies.
You guys REALLY take baths in wine????
The Church does not officially require avoidance of caffeine. Many members assume that caffeine should be avoided because it is a stimulant, and a slightly addictive one at that, which is present in tea and coffee, both of which are forbidden drinks.
It looks to me that ICED tea IS permissible, according to the rules set down.