If there's no diary in it I can't image why it would go bad. Mind you I drink cold coffee all the time later in the day that does have milk in and I haven't died yet....just gone a little crazy but that's about it!
It's pretty much the same as leaving out a glass of water overnight. It may taste a bit stale, but its not a good evnivronment for bacteria, so its generally safe.
I do the same thing...it's fine.
Sparksline, tea is fine left out over night or for several hours because I make sun tea all the time. I will sometimes leave it on the counter for days and drink it that way or put it in the fridge if I want it cold.
I do have a question though, does the tea you drink have caffeine in it? I drink coffee in the morning but I do limit how much caffeine I drink because it has been found to block the absorbtion of some vitamins and nutrients from the foods that I eat. I just wanted to make you aware of that in case you didn't already know that.
Figure out what type of eater you are and you might just find the answer to permanent weight loss.
Take the Diet Profile Test and learn to avoid the pitfalls and self-sabotage that often come with your personal profile.