Does any 110v outlet work with my Freeflow spa?

Yes, any dedicated outlet can be used.

All Freeflow Spa models come standard as a 110v plug-n-play hot tub and can be plugged into a dedicated standard 110v, 15 amp GFCI protected circuit. Your spa also requires a 15 amp single receptacle with an outdoor-rated, weather-resistant receptacle cover plate. 

For your safety, when your electrician is installing the electrical outlet, it should be no closer than five feet and no farther than ten feet from the hot tub. The power cord extends approximately 12 feet but keep in mind that the cord is located on the front of the spa. Never connect your spa to an extension cord, this will void your warranty.