I was told in years gone by, to try and ditch the water when running a 5km. I am now on week 7 run 3 and its hot! I tend to chew on a bit of gum to keep my mouth from drying out, but not sure if I should carry water or not. I'm annoyed enough carrying my phone as not got an arm band thing for new bigger phone, and also get annoyed with my sunglasses after a while and carry them. Am used to doing without. I think I am just an irritable runner at the moment - hot, bothered and very flushed. I marshall at marathons where water is every 3 miles, is there a norm or is it personal choice to carry water?