Simple Follow the instructions on the label.
In case you the image is too small, Given three bottles: 8, 5 and 3 liters capacity, divide 8 liters in half (4 + 4 liters) with the minimum number of wine transfers. Note that the 8-liter bottle is initially filled with 8 liters of wine and the other two bowls are empty. There is no extra wine anywhere, and this is not a trick question. It can be solved.