Doesn't this poem provide a misleading portrayal of water as being subordinated to man? It is merely a toy that can be manipulated by the smallest of human beings; when in fact, water's feature of being drinkable makes us utterly dependant upon it to survive. And this portrayal neglects the often very violent and uncontrollable nature of storms and the ocean.
Perhaps the last line of your poem actually points to what I am saying, and that the child makes such noise at bathtime as acknowledgment of how devastating water can be, despite its appearance as a gentle toy at times.
Water is not only something to drink.
It is a toy for children to play in, I think.
They stomp around in puddles of water,
Which Mama said, "You shouldn't ought a…"
They swim in lakes, and oceans, and pools,
Just to frolic, to splash, and stay cool.
They flap an umbrella in the falling-down rain,
And watch raindrops slide down a windowpane.
They tease their friends with pointed hoses.
They spray it; squirt it, sometimes up their noses.
If water is all of these wonderful toys,
Why is it at bath time kids make such noise?