How to Replenish Water - S1.E12

Homare finds the solitary island where Shion washed ashore and the two are reunited. But there’s no time to rejoice. With no food or water, succumbing to dehydration is only a matter of time… All they have is filthy water they find in a cave… In this dire situation, the two of them use a secret technique for rehydration!? Will Homare and Shion make it back to the island?