It's interesting to note that, when water is really scarce, people can take care of themselves without water. Himba people, living nomad life on savannas of Nam

It's interesting to note that, when water is really scarce, people can take care of themselves without water. Himba people, living nomad life on savannas of Namibia and Angola, practically do not use water for everyday hygiene. Shaving heads (men), making dreads with mud (women), oiling body with liquid butter with ochre pigment from soil. Additionally, women use herbs incense as anti-microbial and fragrance. Added: As culi points out in another comment (https://news.ycombinator.com/item?id=32364340 https://news.ycombinator.com/item?id=32364340) "(...) ammonia oxidizing bacteria can oxidize our sweat and prevent us from stinking. AOBs are found in soils pretty much everywhere."