We have a river in back of neighborhood. It is in walking distance. I would use our wagon and make a few trips. We also have a water detention pond that is about 5 minutes from us driving and maybe 10 to 15 mins. walking. Not sure on walking as I have never walked it. We also have a well that is set to be able to use on generator right now as hurricane Dorian coming our way. Though I think we might just get the heavy rain with flooding in low land areas. In process of figuring out a rain water catchment system other than just rain barrels at the gutters.
We have several ways to filter water including a berkey system.