Rock salt(calcium chloride ) added to water produces heat .I've put it in water bottles to keep fish alive during power outages but you could add it in water bottles to keep the incubator heat up 
	
		
	
	
		
			
		
		
	
				
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8th day of incubation when the power went out5 hours is not that long and the eggs will most likely be just fine if you leave them in the incubator and leave the incubator alone.... If they are not on the first couple of days of incubation.
What day are the eggs on?
