Droughts, demographics, industrialization, pollution, climate change ... The need for more clean and accessible water is growing urgent in many places around the world. But beyond praying to the rain gods, what real-life responses are out there?

Innovation is key both to help preserve clean water sources, as well as finding new ways to purify or recycle water, without the use of polluting sources of energy.

Floating solar power farms, drones, biofilter systems, 3D-printed devices to generate water ... From Israel to India to South Korea, here are five innovative ideas to secure more fresh water for millions of people.