First of all, it is certain that the volume of the last two bottles of liquid is the same;

Then I think the volume of each spoon is the same;

Besides wine, the second spoon is water. Suppose that the total volume of a spoonful is 5, the volume of wine is 3, then the water is 2, and the water of the first spoonful is 5, so there are only three bodies of water left in the bottle ... Think of it this way, no matter how much wine is in the second spoon, its volume is the same as the water left in the bottle, that is, whether it is mixed evenly or not, it is the same.

I don't know if this is simple enough.