put solenoid on ball valve, quick pretty easy solution.

hot water tanks are a common leak point, if thats the concern make
sure the tanks area has drainage to a safe spot.

there are also rotary motor valves, to open and shut balves. a buddy
has one in his car its used to turn off and on natural gas which
powers his vehicles.

one must be careful to not make something so complex it fails more
often.

the one shot solenoid, preferably using 2 solenoids on a ball valve is
probably the ideal solution.

water companies use electric valves thats another probably pricey
solution.