By Rabbi Julian Sinclair, November 3, 2011
If a different wine is brought to the table that is better than the one you had been drinking until that point, then one says a special berachah, hatov v'hameitiv, meaning, "The one who is good and does good". You also say this on hearing certain kinds of good news.
Say that on Friday night everyone has some kiddush wine. Then, during the meal, you crack open a bottle of something else.