How to save tea for a week

I would like to prepare a large batch for a week, but I have no idea how to preserve tea (conditionally 7 liters, one liter per day). Google says that ready-made tea cannot be stored for more than 1 day, even in the refrigerator. And now in more detail, I love sugary drinks, in general I am a fan of sweet tea in many forms, the same liptome is one of my favorite drinks. I can make delicious sweet tea, but I do not know how to preserve it so that at least it does not become disgusting. I'm not going to get something like Lipton, I'm not going to 100% preserve the taste of tea, I just want a delicious sweet drink that I can take with me in the morning and drink throughout the day. I've already tried it, but the tea is getting nasty...