Florida Water is not a closed ingredient. The specific ritual way people in closed religions use it is closed. I've heard some say from Haitian Vodou that they use it because the Iwa like it, so they've developed some of their own ritualistic ways to use it. I've never heard anyone within the closed religions who use it claim that outsiders could not use it. In fact quite the opposite, I've consistently heard them claim that outsiders can.
Florida Water was first crafted and popularized as a cologne in 1808 by a man who made perfumes, Robert I. Murray. In an advertisement in the 1860s by Murray & Lanman, they attributed the origins of Florida Water to be Spanish-speaking colonies in the West Indies, Cuba, and South America.
Using Florida Water in a floor or wall wash is not a closed practice because floor washes and wall washes are common across various communities, even including special ingredients for spiritual means, but any specific rituals or prayers that come from the various closed religions when they make their washes would be considered closed. Using it as an offering to deities from other Pantheons is not closed, but using it as an offering to the Iwa would be closed. The line is mostly, does the practice come from one of those specific closed cultures? Then it's closed.
Nothing about Florida Water is endangered, by the definition of any group, nothing about Florida Water is over harvested to the point the land is suffering specifically to make Florida Water, and nothing about Florida Water has been used as a sacred medicine and has been used for hundreds if not thousands of years, like some other ingredients. There is no shortage and no major poaching for Florida Water or the ingredients.
The original Florida Water mixture, to my knowledge, contained a high proof alcohol, like everclear or vodka, citrus scents like lemon, lime, orange, or bergamot peel or oil, floral scents like lavender, jasmine, and rose, either petals or oil, spices like cinnamon and clove, and for some people, equal parts distilled water to the alcohol, to dilute everything to be less intense. I see some people add rosemary and mint.
The common way I see people do it is to take a mixture of dry ingredients and fill a mason jar with them then top it with alcohol and dilute and strain when transferring to a smaller bottle, if they dilute at all. Some people let it sit for 40 days, others one full lunar cycle of 28-29 days. Some let it charge under the moonlight during those nights, but bring it back in from the sunlight to preserve the potency of the ingredients.
If you wish to pay respects or homage to the closed religions that use Florida Water without stepping into closed practice territory, you can always purchase homemade Florida water from individual practitioners within the Haitian Vodou, Santerรญa, and Hoodoo, and other individual Caribbean and Latin American practices. This gets money directly to people who are making it for consumption by people outside of their religion, and doesn't step on any toes.