I remember seeing a USAF EC-135H performing a very sprightly take off during a show at Mildenhall and the commentator (Airsound?) remarking on something being injected, but whether it was water or methanol I can't recall - there was an interesting moment at about 200' when some combustion could be seen and heard - "added son et lumiere" said our man on the mic... Might have been compressor stalls as I recall it pitched up a fair bit! Long time ago tho, J57 or TF33s, did they ever get modified with CFM-56s?
Wasn't the 707 known by some as the Water Wagon?