Ah, interesting. The applicable section reads:
Section 13651 - Free air and water; public restrooms; display of applicable state and federal fuel taxes
(1) On and after January 1, 2000, every service station in this state shall provide, during operating hours, and make available at no cost to customers who purchase motor vehicle fuel, water, compressed air, and a gauge for measuring air pressure, to the public for use in servicing any passenger vehicle, as defined in Section 465 of the Vehicle Code
... so we need to know how a service station is defined:
Section 13650 - "Service station" defined
"Service station," as used in this chapter, means any establishment which offers for sale or sells gasoline or other motor vehicle fuel to the public.
... so then the question is if electricity is a "fuel" under this section, and whether an unattended DCFC installation is an "establishment."
I could see DCFC networks installing air pumps. Maybe not water lines however! 😉