What he drank last.

How warm he is.

When he ate last.
Then she comes here and mixes a glass of fizz with a little touch of acid, and a bit of cherry, lemon, grape, pineapple, or something sour and cooling, and it hits the spot just as no spot was ever hit before.
I honestly believe that the INTEREST she takes in it is half the trick, for I watch her closely and I can't come within gunshot of her concoctions.

She has a running bill here.

Her father settles once a month.