I have had an instance where i packed in 5 miles at night to an area i had scouted a few months earlier and expected to be able to get water out of a small pond. The small amount of water left in the mud hole that was a pond was unfit for use. I had to go a half mile over some rugged terrain to get water, luckily i had a enough water bottles and a hydration pack that allowed me to carry a full days supply for drinking and cooking. After a few days of that though, it became easier to just move camp closer to water. Moral of the story is prepare for the unexpected because the unexpected usually happens. I now make camps near streams I know to flow even in dry times. I also try to scout in or near the season I will be hunting so as to have a better idea of conditions I will be facing.