No power is needed Doubloon. A small one pound propane bottle is enough for several days use in the small units I have seen. For short time use metal bucket and a cupful of gas should render any fecal matter safe. With all the stranded vehicles gasoline for uses like this should be abundant.
I don't know if F.E.M.A has any mobile toilets available for disasters like this. I do know there are a lot of companies that provide Portable Johns for construction sites etc. "Here Comes Johnny" is one of the local providers in this area.
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