Yes, who would've, since nearly everyone on the planet drinks water every single day. Even the author of the book (who died btw) later admitted that his over-reliance on water as a cure-all was foolish.
You must've been severely dehydrated, and perhaps snacking on salty foods all day long in order for water to help your RLS.
RLS is most often due to a folate (not folic acid) deficiency, along with iron deficiency, and many times a magnesium deficiency.