There were several around me in the top 50 and most of us took water in one form or another at some stage or another...horses courses...the reason I've started carrying water is not just because my body may need it (at 56 kilos I can get away with it for up to 2 hrs easily) but in race situ its actually to placate the mental aspect ie nerves, feeling parched near the start or to break up the climb by having a sip, or washing down that jelllybaby etc. I only carry 200-300ml in my camel and i still have maybe 100ml (i use a diluted juice for sugar n some electrolyte) at the end but there you go, i is mental