Boil it
no ocean water can not be made drinkable by adding salt it would make it even more salty
I guess you could boil it, or use iodizing pills that will mix into the water to clean it. Maybe bleach? but i have no idea the correct method :S --------------------------- 16 drops of bleach (about 0.8 ml) per gallon of water mixed and left to stand for 20 min should render it drinkable as far as bacteria goes (it won't do anything for chemicals).
the water from the nile isn't salt water
Well all water is drinkable just depends where you got the water from and the safest thing to do would be to boil it.
No.
use water filters to clean the polution out.
Get Bear Grills.
Desalination.
Drinking polluted water is likely to make you ill, even causing death depending on the pollutant in the water. Polluted water may also contain parasites that can harm your internal organs.
Water treatment processes used for drinking water are not typically designed to handle the high levels of salt found in seawater. Desalination is a separate process used specifically to remove salt from seawater to make it drinkable.
This is because even though the Earth is mostly covered in water and only around 0.37% of that water is drinkable, we can make water drinkable, but only near the oceans and certain places it's difficult to move massive amounts of water to stock shelves or to be a part of a utility plant, for example certain Areas in Africa are in drought because they have either have very little or no water that goes by them that can made drinkable and even then it takes a lot of time to transport the water. Hope this helps :)
Water pollution can make water unfit to drink.