Let's say I make a pot of tea in the evening. The leaves sit in the infuser overnight. Think its OK to make the second infusion with those leaves the next morning?
I developed my own method for dealing with such a predicament. I've tried rebrewing the re-dried leaves and its terrible. The bacteria or something else about the process changes the taste significantly for the worse. Here's what I do.
I'll make a cup of tea to enjoy right away, the usual way with 1 tsp leaves and ~8-12 oz water with appropriate steep time.
After I filter the leaves, I immediately pour fresh hot water over them and let sit for a lengthier time, maybe an hour or two, then drink that. The temp is cool and the taste is not bitter at all, but maybe a bit weaker.
Again, I immediately pour more hot water over the leaves, and let sit overnight, room temp. I drink it the next morning or even in the afternoon the next day. It is similiar ito the 2nd cup.
This works best with teas that generally don't take well to multiple steepings like blacks and herbals. They lose flavor too quickly, which is why I can steep them so long without making them bitter.
Constantly being in water also protects the leaves from direct bacterial attack. No "weird" tastes are present in my overnight tea.
It might be a weird way of doing things, but I've made many a good cup of tea this way.