I make my own "water infusion" in this weather - a jug of water in the fridge with a few slices of lemon or lime or peppermint leaves or a combination of any of the above! It's my "magic water" (for grandson) and despite having all sorts of expensive drinks in the house, everyone wants some of it 
I saw adverts recently for "cold water infusions" by Tetley and also by Twinings so I thought I'd look for those next time I'm in the supermarket...
Things that (sometimes unreasonably) get on your nerves...hopefully lighthearted

of tea and just plain water.