I have a few teas. I tend to only drink them when I'm running low on other beverages but sometimes I drink them for their effect.
Jasmine suppresses appetite really well.
Green is mentally stimulating but not physically like coffee.
Chamomille is relaxing, but not lethargic.
Black / Orange Pekoe actually increases my appetite, particularly for cafe snacks like bagels or muffins. It's also rather rousing, but not stimulating in anyway.
I keep a stock of powdered beverages too, like cider, hot chocolate, espresso, Kool-aid and Crystal Lite.
It's so great having a kettle and a little collection, I can't imagine how I lived before this habit.