Cold Lipton Green Tea and cinnamon stick hot tea both sound like something worth trying. Yum!
One problem I have with both ordering tea and drinking water at restaurants--especially fast food restaurants which have beverage machines--is that sometimes they seem to taste 'off.' Maybe some of them, especially the teas, were old and should have been made fresh? I have had a few bad experiences, unfortunately. Sometimes I have to wonder just how often 'fresh' beverages are put in those machines. And the water has to be cold--if not, yuck!
I do enjoy drinking water at 'regular' restaurants--and yes--that slice of lemon really does the trick!