Sink or Swim

While it may seem obvious,

I simply must point out

that what I need for living

is the thing that causes droughts.

When stranded on an island

with this necessity all around

I actually could swim in it

- or  even drown! 

So if it's there, you say,

what's getting your goat?

Why not soak it up?

And the problem lies

right in the fact that in it I would float.

The necessity, in its truest form

is really very pure. 

But surrounding this poor island

it's saltier than the norm!

Alright, alright, what is it?

Tell me quickly, though!

Okay, hold on, I'll tell you.

It's drinking water, don't you know?!