HILARY HOWARD / NEW YORK TIMES – Rocky and Ren Hazelman run a chicken farm in West Milford, N.J., about 10 miles south from the Jennings Creek wildfire along the state’s border with New York.

Their 2,000 chickens require about 150 gallons of water daily, and the couple usually has no trouble collecting the needed rainwater for the job. But that is no longer possible …