Kabul, a city of over six million people, could become the first modern city to run out of water in the next five years, a new report has warned.
Groundwater levels in the Afghan capital have dropped drastically due to over-extraction and the effects of climate change, according to a report published by nonprofit Mercy Corps.
Both distillation and reverse osmosis should get rid of microplastics. Reverse osmosis should get rid of mercury in any form, while it would depend on other chemical properties (evaporation rate, temperature source water is heated to, etc.) on whether distillation would remove chemicals like mercury.
Some further reading.