One of the four cardinal points or “quarters” (north, east, south, and west). They are also variously associated in many traditions with each the four classical elements (earth, air, fire, and water) and stars (Fomalhaut, Aldebaran, Regulus, and Antares). The Watchtowers are evoked during the ritual of casting a magic circle.
Alternately, “Watchtowers” may refer specifically to the abodes of the Guardians, with the guardians themselves referred to as “Watchers” or simply “Guardians”.
In Christian influenced magic traditions, they are understood to be the Archangels Uriel, Raphael, Michael, and Gabriel.
Many Wiccan circle-castings no longer mention the Watchtowers by name. Another important development is experimentation with the attribution of elements to the directions, instead of adhering to the attributions used by the Golden Dawn and Gardnerian Wicca (north/earth, east/air, south/fire, west/water). Many Wiccans perceive themselves as participants in an earth-based religion; they believe their practices should reflect their living experience of the local environment. Both the Golden Dawn and early Wicca were active in Great Britain; traditional attributions derived from the British climate may not appeal to or work for practitioners in other climates. A special instance of this problem is the circumstance of Wiccans living in the southern hemisphere, who tend to perceive the north, not the south, as the direction most characterized by fire and heat. Some Neopagans choose to follow the practices of a historical pagan group with whom they identify, or conform to local traditions; either choice may dictate a change of attributions.
Either way, I love the idea of having the watchtowers represented simply and elegantly.
Another easy way to do it would be, water, soil, ashes, and (this sounds odd) but like breathing into the bottle to fill it. Maybe even smoke? I don’t know. Oh course you should purify and charge anything you plan on using on your alter. Maybe with the light of a full moon. I’m not sure.