If you mix 1 liter of pure alcohol with 1 liter of pure water, you'll end up with less than 2 liters of liquid. But wine is a little bit of alcohol already mixe

If you mix 1 liter of pure alcohol with 1 liter of pure water, you'll end up with less than 2 liters of liquid. But wine is a little bit of alcohol already mixed with a lot of water, so the "interstitial molecular crowding" will have already happened. So 1L of wine + 1L of water produces 2L total.