Usage of 'over'

[daemon99]

Husband: Why is there no sugar in the tea?
Wife: No more sugar left in the house. It's over. Got to get it from the store.

Can I use over in this sense?

Customer: Please get me some soup.
Waiter: I'm afraid it's over.

Does it's over mean there's none left in the restaurant to serve the customers?

[Anglika]

Sorry - neither of these is ok.


Wife: No more sugar left in the house. It's finished. I need to buy some more.

Customer: Please get me some soup.
Waiter: I'm afraid it's off [the menu]. We have none left..

[daemon99]

Thanks a lot, Anglika!