Caffeinated tea. I do buy decaf sometimes but as I say, I don't notice any difference in my anxiety levels. I've tried switching to herbal tea but I just don't like it.. I think because I was brought up drinking tea with milk and sugar from a very young age (my Dad is British!) so it was like mother's milk and still is. I do drink herbal teas but more as a "medicine" thing (like I've been feeling nauseous for some reason so I bought some ginger and apple tea today).