I would like to brew a pot of tea and store in it a thermos to keep it hot overnight so I can drink it before getting out of bed.
I've tried this approach and found that although the tea tasted fine freshly brewed, by morning the tea is extremely astringent, as though it had been boiling with the leaves the whole time.
My assumption is that, although I had made some attempt to strain the tea before adding to the thermos, enough of the tea dust became suspended that it continued brewing, releasing tannins, and turning the drink very dry.
What are some ways I can cut down on this effect? I've thought of brewing loose leaves instead of bags, although I know there will be dust there too. Perhaps I could strain through a more effective means than the tea bags or tea strainer? Or maybe I should cool the tea somewhat before adding to the thermos?