how are you today? when giving your reply or answer to this question you have two choices or types of reply which you can give.
you can give a positive response... or a negative response. a good answer... or a bad answer. a happy reply... or an unhappy reply.
examples of a positive reply.
"how are you today?" .
"i'm very well, thank you".
"i'm on top of the world!" .
examples of a negative reply.
"i'm feeling a little unhappy".
"things are not good right now".
"i have had better days".
"i feel down in the dumps".
"i have a bad mood today".
each one of those examples clearly shows how you are feeling and they all effectively explain your emotions 