There's an app called PlugShare where people have flagged locations with regular 120V and 240V plugs as well as off the beaten path chargers. There's even some

There's an app called PlugShare where people have flagged locations with regular 120V and 240V plugs as well as off the beaten path chargers. There's even some people with home chargers that have left a way to contact them in an emergency and they'll let you charge if you ask nicely. Haven't used any of the latter but they exist.