Re: water source
If there is irrigation going on in the bees foraging area, they will find the water. My bees have a rain barrel with 'floats' that is refilled from a downspout, but in spite of that consistent source, I often find then collecting water from the leaves of my lettuce plants.
Bees don't have issues with water with an odor, in fact there are plenty of reports that bees prefer smelly water. Odorous water makes it easier to tell other bees where the "good" water source is.
USDA Zone 7A Elevation 1400 ft