Pour the wine bottle into cup 1 (full), into cup 2, and the water bottle into cup 3.

Pour the third cup into the bottle. At this time, half of the wine bottle is a mixture of water and white wine.

Pour the water bottle into the No.3 cup and the 1 cup into the water bottle. At this time, the water bottle has been mixed with half of the white wine.

Pour the wine bottle into the water bottle, which is half mixed with white wine.

Two cups and three cups are poured into the bottle. It's done.