Elixir of Strife by Nazri Noor

Water, water, everywhere.
Leon Alcantara and Maximilian Drake have barely caught their breath after saving the city from an untimely fate. Now the Jade Spider has a new assignment. A local magical plant shop has requested a strange elixir, the liquid essence of purest water.
In pursuit of the ocean potion, Max stumbles upon a tormentor from his past. Leon faces the challenge of hosting a second dragon, a legend much closer to home. And the mysterious Masques are more watchful than ever, shadowing the boys at every turn.
But strangest of all is a fresh spate of elemental anomalies in Dos Lunas. Life or death, sink or swim, Leon and Max must rise to the challenge — or drown under a tide of wicked magic.