For runs up to 10 km, I find I can go without drinking water without significant discomfort. I drink about 750ml beforehand. After coming back, I'll drink up a good amount of fluids.
Is there an advantage to not regularly hydrating while running short-medium distances? Does it perhaps train the body to make do with less water? Perhaps useful in survival situations?
Or is it strongly preferable to having a few sips every km or so?