My mainstay is Harney’s hot cinnamon ice tea, no sugar, no artificial sweeteners, no calories. Sweet from cinnamon & cloves.
Black tea, fragrant cloves, orange peel and three types of cinnamon bark. Steeped strong, with caffeine but no added sugar.
https://www.harney.com/collections/bottled-beverages/products/ht-hot-cinnamon-spice-iced-tea
My recipe to make a gallon is 6 black tea bags, 4 green tea bags. Supposed to steep in a pot of boiling water for 5-10 minutes. Sometimes I forget and go an hour or two.
Sometimes I dump a little tube of lemonade mix in. My tastes are very unrefined.