First of all it's easier to filter the water than to go spend $500 to get a glass of water from Canadaand sometimes you just need to use what you had we don't need to be spending so much money on something we don't have that we don't really needand we have water filters we need to use them we are not relying on streams and things like that to live now so just use a water filter that you have at your house or maybe one of your friends have one
Algae is warmful for the organisims of the area
Even though it is slums we are talking about, and we know how terrible the conditions are, still there's always some surprises (negative ones unfortunately). Specifically in Mumbai, it is surprising that big portion of the people living in the slums do not have access to city services, they do not have enough water even thought the city itself is surrounded by water, more then half of the population of Mumbai lives in slums (around 55%), most of the residents do not have toilets and have to pay for public toilets...
A presidential system that is a constitutional, federal republic