Don’t be afraid of wood & water. Wood loves the stuff. Most of the tree is water when it’s standing. It’s why they’re so heavy when they come down. It’s all that water inside of them.
Once I had a 1/2″ thick maple table top, 20″ square, all shaped and sanded. I decided to raise the grain and sand it off. Wet sanding I call it, although I wait for the water to dry and just sand off the fuzz raised up by it. Well I wet down this top and it cupped almost 3/8″. This is a very good way to increase your heart rate by the way. Seeing hours of hard work go wacky in a minute.
But I didn’t panic. I breathed deep, flipped the panel over, and wet down the other face. The table top came back to flat. As did my heart rate. If your wood gets wet, wet down the other side. It will be in balance. It’s imbalance that causes movement.