Ok, so here's my thought.  
 
The word of wisdom says no hot drinks, correct? It's not specific, leaving it open for interpretation. Or not? 
 
Maybe it means exactly that, what it says... no hot drinks. However, if people say, "well it means caffeine, or tannic acid", then we're moving into shaping the word of wisdom to fit our lives the way we want it to. That is, if I'm looking at this objectively.  
 
In a religion such as the LDS church, where it literally fills your life with callings and duties to and with our families, maybe it's time to follow the word of wisdom as stated, and stop trying to make it so difficult.  
 
No hot drinks, period. If you take a sip of a warm drink, but it turns out it's hot and you burned your tongue, don't do that again. Seems simple enough. If this isn't what the Prophet meant (I'm assuming it was a Prophet who gave the WoW in the first place), then there needs to be an addendum of some sort. It seems that it would be best to clarify and make it so there is no doubt as to what the members are to do.  
 
Then, when practicing our Agency (free will), we'll know what we're doing and have no doubt about whether or not our choices are seen as right or wrong, by the LDS church. 
 
Would help me, anyway. :)