I did skim over the original link and it is interesting. I imagine that nearness to suitable waters would be a prerequisite. However, those practices would not have been possible for the solitaries I was referring to. But some of the early monks, pre-1066, had a pretty rough life as it was, between religious disputes (they had those then, too) and Viking raids. Even so, their life may have been no worse than average and later, possibly better than average.
The solitaries, but not necessarily hermits, were enclosed religious. They were not permitted to go anywhere outside their enclosure, which in a few cases may have only been a cell. Apparently there were many of them in Britain at one time but the only detailed reference I have was written before WWI, I believe (and I do not have it at hand). Nevertheless, according to one rule book for solitaries that I have, bathing was encouraged and shaving "at certain times" was part of the rule.
Reading over the book, many things remind me of being married.
There are still monk and possibly nuns who live a totally enclosed life, even to the extent of never leaving their enclosures to eat, except once a week. To make that possible, those enclosed are served by lay monks. The only monastery I am in regular contact with is not enclosed, although they still live under a rule.