Water in a dream most often symbolizes emotion, mood, or feelings of vitality. The feeling or action of the water as well as how we relate to it in the dream can also represent how we relate to the emotion that has triggered the dream. For example one can have the feeling of drowning in emotions, or float pleasantly on the surface. The emotions symbolized by water maybe unconscious , hence something like a wave can symbolize incoming emotions. A flood or huge wave can represent a rise in unconscious energy or overwhelming emotions.

 If the water seems sinister or dangerous, that again may tell you something about your being uncomfortable with your feelings or that you have been repressing them.

Entering water by jumping or wading in slowly may represent your entry into a new relationship, job, or other social situation.

 The clearness or muddy-ness of the water in your dream might be telling you something about how secure or sure/unsure you are about entering into something new.

Water is also sometimes said to represent sexual feelings and eros.  Playing in or  with water,  can denote a sudden awakening to love and passion.