How can I stop a particleboard drawer in an RV from crumbling?

Our old park model RV has particleboard drawers in the bathroom. When the faucet was replaced (by a professional), the drawers got sprayed with water and now they crumble into the drawer below every time they are opened. The drawers were completely dry before we useed them, but they still crumble. I'm a widow and could use some advice.