Typical answers to How are you? – How do you do?

POSITIVE    
Fine!
I'm fine, thank you.
Just fine, thanks.
Doing fine, thank you. And you?
Fantastic!
Wonderful!
Great!
I'm doing great!
Alright
Ok
Good!
Pretty good
Not bad!
Cool!
Can't complain!
I'm doing well.
Couldn't be better.
Lovin' life.
Life's great.
Alright.
It's Friday!
Hangin' in there.
Super!
Terrific! Yourself?

NEGATIVE
Not too well!
Had better days!
So, so!
Not so great.
Like I just got run over by a truck
Icky.
Today's not my day.
Fine, I guess...
It's Monday.
Been better.
Lousy.
I'm doing lousy
I'm up to my eyeballs in work.
Very sleepy
Tired
Sleepy
Who cares?
Who wants to know?
Busy...
Getting by
None of your business