Here is a Recipe for good repeatable blueberry wine,
Per 2 Gallon Batch:
6 qts BlueBerrys (home grown is what I use)
8 cups sugar
1-1/2 tsp of yeast nutrient
1 pack of lalvin RC-212 yeast
1 camden tablet
splash of lemon concentrate
Mash blue berrys in wine press or pan. Boil berries in 1 gallon of water for 2-6 minutes. Mix sugar into blueberry liquid. Take small sample off pot and let cool. Add yeast nutrient and yeast. Let the yeast slowly work into the solution. when main batch is down to around 90-80 degrees F add yeast mixture. Crush camden tablet and add to mixture. Put wine in Primary fermenter and stir (or shake) twice daily. Ferment for 14 days in primary then transfer to the secondary. Ferment another 7 days then siphon the wine into bottles and rack. If wine is not clear re-rack wine in 10-15 days.
I don't know how long this will last for (can't keep it around for very long it is way to yummy)
Usually produces around 18-22 percent alcohol.