JT9D-59A as fitted to DC10-40 and A300 has water injection, exactly the same engine (literally identical in every way and not just different JT9 model) fitted to late B747-200's and redesignated as JT9D-7Q does not
All the Fokker F27-400 and 600 aircraft I have seen have water-methanol as standard, Dart 532-7R rings a bell?, the tanks are mounted at the rear of the engine pod behind the LG space and have a tendancy to break out of their mountings in the event of a heavy landing