We made a Tea wine for the standard wine competition in our club a few years back. Everyone used the same recipe but choice of tea was left to individuals. If my memory serves me right it was only 10 Tea bags brewed for ten minutes 1 litre of grape juice + sugar to make a UK gallon of semisweet wine. Wasn't exceptional but a drinkable wine. My CEO was quite chuffed about it as she won it.