Ryanair have four hundred airplanes so there must be at lot of captains who could answer this rather simple question. Do you get fired if you tell someone or is there some other reason?
I'd imagine most are ashamed that they are working to the poor conditions that they are on, and contributing to the declining T&Cs across the industry. Not even being valued highly enough to be given water is fairly demoralising
Just my opinion of course.