If you keep it refrigerated and don’t add anything to it, it should be fine.
I made the mistake of making coffee ahead in large amounts one summer. But I also put sugar in while it was still hot.
After a few days, it got thick and sort of mucillagenous. It tasted Ok, but coffee isn’t supposed to be slimy like that.
But when I left the sugar out it was fine and made great iced coffee.
Obviously it tastes better fresh made due to the added flavor compounds from the volatile oils. But it wasn’t horrible.
The other thing you might want to try is cold brewing.
This eliminates a good deal of the acidity and is supposed to taste really good.
I’ve been meaning to experiment with this technique myself.