Say you had in mind to have a regular meal with bread. After washing and saying homotzi lechem min harataz and taking a bite of bread, you realize that the bread is bad.
Now all you have left to eat is mezonot/shechokol/etc.
Do you say an individual bracha for each food category and their respective bracha acharonas or does the single bite of bread cover everything. If the latter, what is the bracha acharona?
Is there a difference if you ate a bite of the spoiled bread (less than a kezayit) or if you ate no bread at at all? Do you have an obligation to take a bite?