We are facing an international crisis when it comes to water. Cities worldwide are nearing their day zero, a euphemism for the end of all drinkable water. And climate change, salinity, heavy metal pollution all are exacerbating the pressing issue. At this moment, a staggering 0.5 billion people are denied access to safe drinking water, while 2.3 billion live without access to basic sanitation. And Bangladesh is expected to be one of the worst-hit countries in the coming years, with a rapidly rising population, riddled with natural disasters the situation worsens almost every day. The problem for Bangladesh is the availability of safe water as 50% of the population consume unsafe water, and over 2,000 children under five years of age die from diarrheal diseases each year caused by poor water and sanitation. And with a rising sea level, the water salinity levels are also seeing a drastic elevation, rendering water bodies around the country inoperable. The salinity problem is expected to worsen in the coming years. Scientists estimate the southern part of Bangladesh to be underwater by the year 2050, making increase in water salinity an existential threat. Besides salinity, arsenic pollution, microbial population, industrial and chemical toxic wastes are contaminating the surface water at a threatening level.