Finding and transporting water
Linkdump
Site (with ads) with some good information on finding water, in particular looking at different geographical zones and water discovery/harvesting.
https://tacticalgear.com/experts/how-to-find-water-in-a-survival-situation
Oxfam page on trucking large volumes of water in an emergency, or 'water trucking'
https://www.oxfamwash.org/en/water/water-trucking
Some basics as to transporting water.
https://modernsurvivalblog.com/preps/methods-to-transport-emergency-water-from-source-to-home/
Some basics from the CDC that many may not think of when anxious in an emergency, like the water in the toilet tank (not bowl):
https://www.cdc.gov/healthywater/emergency/finding-other-sources.html