Basicly, what I did was boil water and dissolved the sugar in the water. Once the water cools I mix the water sugar syrup into the wine. I dont try to speed up the fermentation, if yeast is present, it will startup on its on. It might and probably will be slow to start when you are adding sugar in increments simply because the alcohol in the wine will slow the yeast multiplying. Thats just my assumption based on the inhibiting factor, (alcohol), dont know if I read that somewhere or not. I am sure one could add some extra nutrients, maybe some extra yeast, whatever, and speed it up, but I dont drink that much and just aint in no hurry to get it made.