In the four classical elements, water is a feminine energy and highly connected with the aspects of the Goddess. In some traditions of Wicca, this symbol is used to represent the second degree of initiation. The inverted triangle itself is considered feminine, and is associated with the shape of the womb. Water can also be represented by a circle with a horizontal crossbar, or by a series of three wavy lines.
Water is connected to the West, and is typically related to healing and purification. After all, holy water is used in nearly every spiritual path! Typically, holy water is regular water that has had salt added to it -- an additional symbol of purification -- and then a blessing is said over it to consecrate it. In many Wiccan covens, such water is used to consecrate the circle and all the tools within it.
Many cultures feature water spirits as part of their folklore and mythology. To the Greeks, a water spirit known as a naiad often presided over a spring or stream. The Romans had a similar entity found in the Camenae. Among a number of the ethnic groups of Cameroon, the water spirits called jengu serve as protective deities, which is not uncommon among other African diasporic faiths: Legends and Folklore of Water.
At the time of the full moon, use water scrying to aid you with divination. In Elements of Witchcraft, author Ellen Dugan suggests doing a focused meditation to communicate with water spirits such as undines.
Use water in rituals involving love and other fluid emotions -- if you have access to a river or stream, you can incorporate this into your magical workings. Allow a current to carry away anything negative that you wish to be rid of.