Check out the second edition of elrha's WASH Innovation Catalogue. There's a section on safe water innovations, to address challenges to providing safe water in emergencies.
They have prioritized innovations looking to:
- Build evidence of the effectiveness of existing household water filters in a humanitarian setting
- Develop innovative emergency household and community water treatment technologies or adapt existing technologies
- Develop rapid and effective tools and methods to monitor and test water quality in emergencies and
- Develop research and guidance for safe water provision