If you're ever in an emergency and need air in your car tires or water for your car engine, you only need to go to the nearest gas station. California law requires that every gas station provide it's customers free compressed air, water and tire gauges to be used in servicing your car. To be a "customer", you must make a purchase at the gas station of any product they have available, including, of course, gas.
To deal with an emergency of a different kind, every gas station within a 1/8th mile of a freeway off-ramp must also provide clean and sanitary public restrooms to their customers.
If the air/water machine or the bathroom require the deposit of coins, the attendant should provide coins or tokens.