There's more wine in the water than water in the wine. What you added to the water was 100% wine. What you added to the wine was one tablespoon from a liter of water with one tablespoon of wine mixed in.

What you added to the water was pure wine.
What you added to the wine was water and wine.

While it's true that one tablespoon of wine was removed from the liter of wine, slightly less than a tablespoon of water was removed from the liter of water--some of it was wine that got put back into the liter of wine.