reduced to 3/4 cup .
essentially the entire bottle of the wine's flavor is in the bowl of mash
while not making a big bowl of soup.
I usually have to add a little cold water at the very end to get the final consistency I like.
so if the wine is reduced to a cup , or a cup and a half
less water might be needed at the end.
Id rather add a little water
as once its i n , from any source , its difficult remove.