Water Injection?
It reminds me of a conversation once upon a time that went a bit like this when I was Duty Auth and in swaggered a visiting JJF&HHST* mate asking "Have you any de-ionised water?"
Quick as a flash the Rects Chief said with a smirk "Did you bring your travel iron with you, Sir? I can ask the Mess if they can help?" To which I added "He'll need more than a small iron to bring the creases out of those ridiculous flaps on his boots, Chief!"
The Harrier jock looked most unamused and said "No it's for my engine!". Then the JEngO chipped in hardly looking up "We normally put AVTUR in engines mate".
Off he toddled shaking his head "I'll take that as a No then..!"
*Jump Jet Fanny & Her Hawker Siddley Tw@t