Quote:
Originally Posted by VydorScope
There is no one right way, but here are a plenty of correct ways:
- I am tired right now, so I am going for a coffee to wake me up.
- I am tired right now. I am going to get a coffee to wake me up.
- I am tired right now, therefor I am leaving to get some coffee which I hope will wake me up!
But none talks like that here in America. More commonly you would here:
I need coffee.
The "I am tired" and "going for a coffee" are assumed when the person gets up to leave after saying that. You could add 'really' to emphasize how tired you are:
I really need coffee.
If you wanted to express the the action this would be more common:
- I am off to get some coffee.
- I am running out to get coffee.
- I need to wake up, so I am off to get coffee.
But in conversation we often drop an obvious subject so you might hear
Off to get coffee, be right back.
Just remember... grammar is written after the language is created and describes the language, it does not set rules on it. 
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"What we have here is a failure to communicate."
I'm pretty sure that aceflor was looking for clarification on her statement about declinations, not her statement about coffee.