Unlike a dog, a Chinese water dragon does not wear a collar or walk on a leash as a matter of routine, but a few handling-related accessories make care safer and less stressful. Soft, snug-fitting reptile harnesses exist for supervised outings, though they should be used cautiously, only on calm, well-acclimated animals, and never left on unattended.
For day-to-day interaction, the most useful tools are simply clean hands and patience, but a lightweight, breathable cloth or small soft towel can help support and gently steady a squirmy dragon during health checks or moves between enclosures. The aim is always to support the body fully rather than grip in a way that triggers a panic response.
For animals that are nervous, or being assessed for illness or injury, the priority is gear that reduces struggle. A quiet, contained handling space and a soft surface to set the animal on lower the stress of any necessary handling far more than any specialized restraint device.