No, it is an inamimate fluid= a compound Hydrogen Oxide, that of course, supports and is absolutely vital to all kinds of life forms, particularily in ponds. Water itself is inanimate fluid.
The water in the sea and oceans are saltwater.
By osmoregulation. Differs by species or type of organism, but they are either osmoconformers or osmoregulators.
No. Organisms require organic material in them (though that alone is not sufficient). Water, on the other hand, is an inorganic compound.
so they can survive!