Earbud fell in cup of cold tea?

Depends on the tea, was it sweetened with sugar or honey. If it was put it in the trash now as the sugar will rot out the electronics. If it was plain tea, put it in a pile of rice and dry it out for 24 hours+ and likely will be fine, at least you have a fighting chance with it. Good luck, it's the old water and electrics don't make a good match thing, sorry about that.