A Dictionary of Dream Symbols
by Eric Ackroyd(2) Water may be a symbol of the feminine in its positive aspect, in which case your floating will mean relying on / being supported by ‘woman’, which in turn may mean an actual woman or women (if you are a man); mother; or the feminine side of your own psyche. (The male psyche has a feminine dimension (anima), just as the female psyche has a masculine dimension (animus).
See Brother / Sister, section (4)) The dream is probably recommending that you put more trust in (your own) femininity.
(3) The feminine represented by the water may be Mother Nature; and the floating will then signify identifying with or going along with Nature, or your true inner self, as distinct from being pushed about in the man-made world of economic and moral and emotional pressures.
Ten Thousand Dream Dictionary
by Pamela Ball2- Because we are not taking charge of our own direction, we are being indecisive and perhaps need to think more carefully about our actions and involvements with other people.
3- Out of Body Experiences.