Iced tea?

I’ve made or tried to make tea most of my adult life, unsweet. Never came out right and used every brand under the sun. Now I get three big cups from McDonalds $3. Wife and I know ALL the good places for tea in town. Can’t drink any sweet tea, maybe two sips if I’m hard up then on the ground. Coffe the same way, just can’t get the taste right (5 different makers) Sheetz was great till they went to the instant makers, horrible now. I think the secret is very large batches but not sure.