Demitria Lunetta 
Our Broken Earth (Malcolm Walker, Book 1) [PDF ebook] 

In the near future, the tides are rising, the weather is out of control, and the rain is poison. Mal lost his family in a storm and now lives with other young people, trying to survive the changing world. Faced with the threat of the rising water and his friend’s illness, Mal and his makeshift family must travel across the country to reach a safe place. But the road is dangerous and not all will find their way safely to their new home.