Iced tea is a habit I picked up in Japan. Not the revolting canned stuff with added sugar and lemon they sell in this country – just chilled tea. It works quite well to put some tea leaves in a jug of water and leave it in the fridge for a few hours. You end up with a very light tea – scented water, really. It’s the perfect soft drink for grown-ups. I’ve been using things like oolong, green tea, and jasmine tea, but I daresay you could use any tea. Or indeed something like rooibos. I wonder if herbal things would work. I might try verveine (lemon verbena).