Bava Batra 96: Wine, Wine, Wine, Wine... Vinegar

More on wine that may have become vinegar - this case, in a barrel from which terumot and ma'aserot may have been taken. Does the barrel turn from the top or from the bottom? What if the liquid smells of vinegar, but tastes of wine? How to determine thee time of the turning? Also, more on the suitable use of the generic "Shehakol" blessing, as compared to "Borei Pri HaGefen" blessing - for various beverages.