It is really... irrational, to have an irrational fear of water. It is all about understanding the dynamics of you, the environment that you are in, and the relationship between the two. Yes, people drown in rivers and oceans, people get bitten by sharks, people step on stingrays or whatever, yes people drink seawater and it doesn't do them good. But that is all a matter of stupidity. If you are mindful and cautious, you will not need to worry about such things.
It is all about understanding how one can manipulate the water around their body to both stay afloat and move oneself around. Your lungs are basically a floatation system. I discovered this not trying to stay afloat... but trying to submerge myself. With my lungs full, I have to exert far more energy trying to stay submerged than I do trying to stay afloat.
I really pity it people who cannot swim, it is good excersise and great fun. Like the poor man's weightlessness, almost. :lol: