Always more to the story
Usually, there is more behind a story than what is initially apparent. This is one of those cases. From what I have been told and found out so far, this individual may have had a few other issues with this particular company.
On top of that, it was not crew water, but water that was reserved for the use of the Executive Class passengers. Crew have their own supply. Crewmembers had been specifically advise NOT to use the Executive Class supplies but rather use their own provisions.
I have not verified the facts, but did ask a fair number of questions as this type of action appears just too severe for an operating company. Not been here long, but so far find working here quite enjoyable. As with anywhere, know and abide by the rules, even the silly ones, as long as they do not endanger your passengers and crew (or yourself).
Also, investigate any story that seems "off".