I keep the water meter key and a big crescent wrench for the gas meter on hooks by the back door of the garage. ...the crescent wrench will shut off the water main also but I'm not reaching down in a valve box full of black widows if I don't have to.
Everyone in the house knows where the water and gas valves are and how to shut them off. Also where the circuit breakers, solar and air conditioner disconnects are and what to do with them.
It's good to know where all that stuff is on your neighbor's house is also.
