What exactly is Fluid Ounce?
A US fluid ounce is equivalent to 116 of a US liquid pint and 128 of a US liquid gallon, or precisely 29.5735295625 mL, which is approximately 4.08% bigger than an imperial fluid ounce.
how many ounces in a bottle of wine
That will depend on the size
STANDARD

Let’s begin with a regular wine bottle. These bottles hold 25.4 oz (750 ml) of wine.

SPLIT, DEMI, OR HALF
This bottle is exactly what it sounds like; it contains half the amount of wine as a full bottle (standard). You will receive 12.07 oz (375 ml). QUARTER (IN CHAMPAGNE, A “PICCOLO” OR “SPLIT”)
When compared to a conventional bottle of wine, a quarter contains one-fourth the amount of alcohol. So you’ll get 6.03 ounces (187 ml) of wine.

CANS MADE OF ALUMINUM (AMERICAN BEER CAN SIZE)
For convenience, some wines will be packaged in aluminum cans.

Source: https://mycalcu.com/