A week from Sunday?

[Guest]

I actually have two questions. One must be easy for English speakers and the other one rather complicated.

1.
Is "a week from Sunday" next Sunday or Saturday?

2.
About a passage from a story I read. Basically, it's two friends met at a bar. Let's say A and B. A had been drinking when B showed up. As soon as B showed up, A handed a glass of grape wine to B and said, "I'm taking you right to the Allen Vineyard. None of this mediocre wine for you." B answered, "You are, are you?", and took a sip and thanked A.

Although there were only three sentences, I don't understand their conversation at all. What did A mean by saying "I'm taking you right to the Allen Vineyard"? Because it doesn't look like they were really going to some vineyard. And "none of this mediocre wine for you" seems to be gramatically fragmented and I can't make head or tail of it. Therefore, I don't know what B meant by saying "you are, are you", either.

Hope you can help me and thanks!

[Mister Micawber]

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1-- the second Sunday in the future.

2-- I am not familiar with 'the Allen Vineyard', and I suppose it is fictional, but the conversation means approximately:

A: I'm taking you right to the Allen Vineyard. None of this mediocre wine for you. = Have some of this high quality wine from Allen Vineyard.

B: You are, are you? = Oh, this is wine from Allen Vineyard? Great!

(This sounds a little odd in the first speech, because 'this wine' is presumably the good wine-- but I cannot think of another interpretation with the context you have given us.)
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Native English teacher at Mister Micawber's