can you use regular bread yeast to make blackberry wine? how important is the yeast you use?
Yes, but it is not very good. It can give the wine a funny taste and often will not make very strong alcohol. It is good for making bread !
Wine yeast works very well with wine and there are lots of different kinds. Some will improve the taste of your finished wine, others work at low temperatures or produce high alcohol etc etc.
It is always best to use a good quality wine yeast.