Could you help me?

Greetings, Lucas,

1. I want to fetch some coffee. (*go to coffee is a non-native formation);

2. I would like to have a coffee break. (You cannot *go to break);

3. All right. + Let's go and have a coffee. + Let's go drink a coffee (omission of and is colloquial)

Respectfully, Gleb Chebrikoff

lucas21c1. I want to go to coffee. (It means, I want to go to grab a coffee.)

Hi, lucas21c

A word to the wise: I would phrase your sentence differently:
I want to go bring a coffee/some coffee

In AmE the word "fetch" in large part is used to decribe what dogs do with a stick when you play fetch with them, it is

Any of these combinations is fine:

I [want / would like] to go for [coffee / a coffee break].
Let's go for [coffee / a coffee break].

CJ

MrPernicketyIn AmE the word "fetch" in large part is used to describe what dogs do with a stick when you play fetch with them

And also what black slaves were said to do back in the days before the Civil War, as in the expression "Step and fetch it".

CJ

CalifJimas in the expression "Step and fetch it".