Tea and coffee are packed as much for cultural habit as anything. Both have the stimulant caffeine and various pros and con health issues from blood pressure to wiping out free radicals. Coffee is supposed to be diuretic, but between police officers of Old Bald Guy's generation, caravanseri on the Silk Road and naval petty officers with permanently crooked forefingers and thumbs for cups I wouldn't stay up nights worrying about it. I figure some dietician working next door to the labrats who conjured magnesium fire starters and solar stills came up with this. You also have the options of cocoa, various powdered ciders, fruit drinks etc. The tradition of strong cowboy coffee was both as a simulant and to mask pretty bad water. And thats what modern drinks also provide. Teas are actually pretty simple. You have green, black and oolong. All are from the same plant and there are countless varieties. You can get in more trouble with herbal teas. Pack what you like. A BO situation is no time to try Chai tea on an already stressed system.