I don't think it matters what you drink so long as you find it soothing and enjoyable. Chamomile is known for its calming effects. I've read that kava kava is good for anxiety. You have to be careful that you don't drink it all the time as it can cause liver damage in some people. Valerian is good for helping you sleep. During times of super high anxiety it may have a calming effect without making you drowsy. I've never tried it so I have no idea really. The Panera Bread restaurant near me offers a sublime ginger mint tea made by The Republic of Tea that I love. It doesn't have to be herbal tea. It can be regular black tea so long as caffeine does not make your anxiety worse. You could try the relaxation drinks that are starting to come on the market - the opposite of energy drinks.