i am a bit obsessive with that im afraid.
i weigh in at 11.30am every week and on that day i have no shake until i have weighed in and the only fluid i have is at 8am to take my morning meds (about half a glass of water).
i take water and a tetra to my weigh in and as soon as i get in the car afterwards i am glugging shake and water one after another.
a few weeks ago i forgot to take water with me and we went straight to grocery shopping from my weigh in..... where i almost passed out.
i blamed it on the fact it was a warm day but had i had my water with me im sure i would have been fine.