I flew the KC 135 from 1974 to 1988. The A model carried 2000 lbs of demineralized water that lasted about 2 minutes on takeoff which usually got us up to 500 feet or so if heavy and 2000 feet if light. It could be used down to 40 degrees F. It gave a little over 1000 lbs of thrust per engine which is needed when the engine only puts out a little over 12,000 lbs for a 297,000 lb airplane. The R model's CFM 56 put out 22,000 lbs. We were like kids with a new toy. The E models were re-engined with JT3Ds that put out 18,000 lbs of thrust so they didn't need water injection. I only really know about the tanker versions of the plane.