I have water on the knee what do you suggest?

Water on the knee: Orthopedic surgery consult & probable MRI imaging to possibly identify the cause. Could be a tone meniscus, arthritis, infection, etc

Joint effusion: Unless contraindicated joint Tap with joint fluid analysis will relieve symptoms and estabilish etiology

Knee effusion: Small effusion can absorb by itself, anti inflammatories can also be tried. Sometimes effusions can be drained too . Examination would guide which is the best thing to do . Please consult with your doctor .