My wife loves blueberries and asked me to make a batch of blueberry wine for her. I bought a big can vintners harvest ( I think thats the name) blueberry syrup. I followed the directions on the can for a 5 gallon batch and got an OG of 1.110.........I figured OH WELL lets see how it ends up. It was fermenting and my wife asked to taste it. she said she LOVED it right where it was at and asked if I could just bottle it like it is. I stopped the fermentation and added some gelatin ( crystal clear now) ANYWAY the SG is only 1.036!!! She loves it and to me it tastes like blueberry syrup. Everyone else loves it ( I bottled 24 bottles and put them away...she kept one out to let folks taste) NOW my son has blackberry wine going and wants it sweet like his moms wine... I know his has fermented past the 1.036 point but I don't know how to calculate how much sugar to add to get there. I know how to taste test and measure and add but I also know there is a formula somewhere. Anyone wanna point me in the right direction?