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How Can I Get Hot Water for Steam Vac in my Mobile Auto Wash & Detail Business?

I just began my own Mobile Auto Wash and Detailing buisness … got the work van with the power washer, big water tank, generator, shop vac, all that, to clean up and detail vehicles on the spot at peoples houses or at their work, and some car lots. Now the question is, I got this Bissell Little Green Machine Steam Vac that I use to clean carpets in vehicles, but I need some ideas on, how can I get hot water to put into machine to use if I’m mobile and on-site at a job? I got the water, but need hot water to mix with cleaning solution! Don’t think it’ll work the same if I’m using cold or regular temp. water, right? And I can’t just ask whatever business place I’m at or anybody “uh, mind if I use your hot water? durrrr! ” I have a power generator in my work van also if that’s any helpful. All I can come up with is to get one of those hot pots and plug it up and put some water in it to get hot, but that’s kinda ghetto! Any helpful suggestions would be greatly appreciated!