It's possible that it's only hearsay, and if the water was indeed poisoned it's not certain that settlers did it. Palestinians aren't allowed to have normal plumbing and Israel restricts their water allocation to below WHO minimum standards, so there are many other possible causes. If BTS made an official claim that the water was poisoned, it would most probably be true, as BTS has always been right before, which is one of the main reasons why people believe them.
It's however a bit scary is that you use a fascist organization like Im Tirtzu as a source.
Im Tirtzu
From Wikipedia, the free encyclopedia
Im Tirtzu (Hebrew: אם תרצו, lit. 'If you will it') is a Zionist extra-parliamentary group based in Israel. Its name is based on a phrase coined by Theodor Herzl – "אם תרצו, אין זו אגדה" or "If you will it, it is no dream."
The group has been described as belonging to the ultra-right, ultranationalist and ultra-Zionist, but describes itself as centrist. The group's stated goal is to strengthen and promote "Zionist values" throughout Israel, especially on college campuses. Im Tirtzu is mostly known for its campaign against the New Israel Fund and against alleged bias in university curriculum.
In 2010, Im Tirtzu filed a libel suit against five Facebook users on the grounds that they created a group calling Im Tirtzu "fascist" and comparing it to the Nazi regime. A court in Jerusalem determined that the use of the term "Fascist" was not libelous, but that the comparison to the Nazi regime was not protected speech. Both Im Tirtzu and the defendants appealed to the high court. In the appeal, the high court overturned the previous ruling and decided that the libel suit should have not been heard in court, since the main discussion is ideological, not legal.
Read more:
https://en.wikipedia.org/wiki/Im_Tirtzu
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