Do I need to get professional water damage repair, or can I handle this?
Let it dry for a week or 2 &amp; if nothing's gotten worse &amp; you're not even or barely noticing it with your feet then let it go. Tearing the floor up for a cup or 2 of water that's already gone isn't worth it.

If it actually bothers you later you can sand the cupping down &amp; back to flat. You'll have to re-stain &amp; re-polyurethane the area after that.

Every floor cups a tiny bit all over the place from humidity eventually &amp; you may find some parts of the floor elsewhere are worse. Think of it as character.