I have a salt water pool and spa.  

See what the pool company has to say.

At 2 properties removed the pools. 

Is getting a $500 above ground pool worth it? 

Usually if it is something no HoA I solve the issues but now the prolem is under the HoA mercy that seems to careless and the water damages are severe and scary on the photos.

The issue with watering your foundation is that you have to do it always, every year without a break in order to achieve the desired effect.

Should I provide my guests with bottled water or a Brita water filter or leave it up to the guests to bring their own water?

Water from the well has sediments and water forms a yellow lining in toilet.

Note that water penetration is not limited to flooding from rising water levels on the ground in a weather event.

Glazing in walls, enclosures or fences containing or facing hot tubs, spas, whirlpools, saunas, steam rooms, bathtubs, showers and indoor or outdoor swimming pools where the bottom exposed edge of the glazing is less than 60 inches (1524 mm) measured vertically above any standing or walking surface shall be considered to be a hazardous location.