I usually bring some sort of Drink Mix. I LOVE Arizona Diet Green Tea......they do make a DECAF version but I've never found it in the store, so I ordered it on line..................One "Tub" makes a weak tea in a 3 liter Poland springs bottle. at least I drink more water this way. At HOME, if I get really energetic, I make the tea, freeze in in ice cube trays and use THAT ice for my tea.