Hi to all,

I have a wine which is now 1.5 years old, however due to poor
misjudjement the alcohol content in it is quite low. The taste is
good and there is no apparent spoilage. However, the lack of alcohol
does retract from the overall taste. The wine is now bottled.

I need to add sugar, allow it to referment in appropriate bottles. And
drink it immediately as sparkling wine.
Can I just add sugar to referment it to proper levels? And how much
could I leave it for it to referment?