I actually ran out of water playing 9 holes and was super thirsty going into the 7th hole. Going to have to bring to 2 water bottles as it gets hotter. I would imagine 18 would require 4 bottles, maybe even 5. That's a lot of water. It is what it is.
That was a pet project for Hank Gordon, I think around 1990 or so, he apparently always wanted to design a golf course. Hank was a long time member at Fairfax CC, I think I played a B-Team match against him there.