My favorite part about purchasing iced tea in the store is that you will have 2 bottles sitting right next to each other. One will contain a product that costs far more and both will cost the same price. The main cost of sweet tea is sugar. No sugar in unsweet tea, just water and tea leaves...
Note the € sign - it’ll be nearly as expensive and you’ll only find 2-3 flavors if you’re lucky (US expat in NL)
Op: Brew your own tea and make your own. Or reduce it by half and add it as a concentrate to fizzy water if you need the bubbles. Also, equal parts sugar and water, low heat in a saucepan until reduced by ⅓-½ and you’ve got sugar syrup. That lasts in the fridge forever, and you can make it as sweet or not as you’d like.
Use low to medium heat - too hot and you can make the concentrates bitter or crystallized. 😉 The tea concentrate can be kept in the fridge for about a week, but keep it capped.