My best friend (sadly now dead), was a hypochondriac. So, when she read something saying so and so was good for you, she never really tried to find out more.
One morning, she arrived at my house (we were due to go out for the day),looking decidedly poorly. Dizzy, and feeling nauseous. I asked her what she had done that morning (besides her normal morning run and trip to the gym!!!). She told me that she had drunk three litres of water, - in one go!!!! (She had read that she should have this each day and wanted to get it 'out of the way' before she went out!!!
I took her straight down to A&E. Concerned (and they were also), that not just sodium levels would be too low, but she could actually be 'drowning' some of her organs. Fortunately, after being kept in for observation for a few hours she was fine
One of my foster childrens fathers overdosed on prescription drugs accidently - he took double the dose as he felt that if one etc. was good for him then two must be doubly good. He died from this!!!
Just saying that we do need to have a greater understanding of what our bodies need and how it is supplied. Even on this thread there seem to be people who think that water is the only fluid that counts towards our daily intake. Anything, other than alcohol, is part of that fluid - tea coffee, etc. etc.
Fluid is important, too much fluid is dangerous. Drink when you start to feel slightly thirsty. Yes, I know that thirst indicates that we are dehydrated - but to drink when your body is not indicating any need for it can result in over-hydration.