Five steps from a problem to its solution.

Help me design and build a first working prototype for this problem in Dabolim, Goa, India.

Problem: Residents of housing complexes in Goa can't check whether the borewell water their builder supplies has been tested and is safe.
Who it hurts: Families in apartment complexes in Goa where water comes from a borewell and an underground sump run by the builder or society, rather than straight from the public supply.
The moment it hurts: Several neighbours fall ill with diarrhoea in the same week, and no one knows whether the tap water is the cause.
What people do today: Testing happens only after an outbreak, when health centres and the Pollution Control Board collect samples, and residents wait for the reports.
Why it is still unsolved: Private water sources inside complexes are not routinely tested or published, so problems are found through illness rather than before it.
What solved looks like: A simple record for each housing complex in Goa showing its water sources, the date and result of the latest test, and how sewage is treated, with an easy way for residents to request a test and to report illness clusters early to the local health centre.
Where: Dabolim, Goa, India

First, list what you would need to learn from the people affected before building, as interview questions.
Then propose the simplest version that would help, the screens or messages it needs, and the data it would use.
Keep it cheap to run, accessible, and respectful of people's privacy. Flag anything you are unsure about instead of guessing.