...keep the water volume down...and use a natural soap[,] it shouldn't matter too much. What are some decent soaps...
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a)
My sisters and nieces make organic soaps with goat milk and coconut oil.
For something similar, ask around at any local-owned family-operated hippie shop or natural foods grocery.
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Why them, the little guys, instead of Global-Domination*Mart?
Accountability.
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b)
We shower [verb] each afternoon.
We can use less than three quarts/liters/litres per shower [noun].
We boondock exclusively.
Over two decades full-time live-aboard, in at least a dozen countries, zero issues.
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However, we are discreet, thoughtful, observant.
As our Esteemed Correspondent notes, shower-water is a form of sewage, and although it is extremely weak and instantly invisible compared to a squishy, it should probably be buried with other waste products.
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Saying a few words of last respects during the interment should help clear your path as you stand before the Pearly Gates.
Hopefully, after a long rich life filled with joy, but still.
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And if your idea of 'joy' potentially includes the process of producing a suitably satisfying squishy, we could probably be pals.
['points' for alliteration?]
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c)
!!! Warning Caution Alert !!!
Any LawEnforcementOfficial or other employee of the BureauOfJustifyingOurExistence could make the case any water touched by folks -- then touching the ground -- could irreparably alter the landscape for milillea milemnea milinea multiple centuries.
Scoldings and notes in Your Permanent Record may result.
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Accordingly, you should probably shower [verb] away from cow-patties, coyote squishies, or goose- and bison- and elk- and gull-droppings.
And 'yes', dealing with the 'C' category crowd, we consistently see self-contradictory rules and behavior [shrugs indifferently].
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keyword -- invisible and discreet