No replacing the subfloor. It's stained, not damaged. Don't look at it please.

I agree w/ Joseph. You have minimal water staining and no damage. Let it dry thoroughly & then button it back up.

By coincidence, I have a similar problem except it was the disposal that leaked. I took out one and one-half gallons of water when I realized the problem. The disposal was replaced.

There is no basement and my house is one story, so no problem there. This is Florida, so the house is on a concrete pad. However, the cabinet floor below the sink has delaminated and severely warped. The water was drawn up into the sides of the under-sink cabinet and they have delaminated at the bottom, but I'm not concerned with that. However, I think the bottom board of the cabinet should be replaced.

My under-sink cabinet is the same design as the original poster. How would I go about replacing the bottom board? I'm not sure how to remove the center, vertical piece that separates the doors. It does not appear to be fastened in place with nails or screws. Can anyone give me insight into this? In order to remove and replace the bottom, I need to temporarily remove that vertical piece.

@Tony Lombardi, same issue here. What did you end up doing?

We replaced the cabinets and kept the subfloor; Drying it was enough for the subfloor.