"[Science fiction] is the one literary medium left in which we have a free hand. We can do any damn thing we please."
The Fremen were tribal people who lived in the desert that covered the surface of the planet Dune. All moisture was precious; even the water in a person's body was carefully conserved after death.
How did the Fremen do it? One possible approach involves imitating plants with surfaces that have low binding tension - water just slides off. Such surfaces are made from a hydrophobic substance - usually wax-like in character. But "bumps" make it work even better:
Water Repellent Surface-related
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