The best evidence to support the statement "bathwater was a shared resource in 19th-century homes" includes the following excerpts:
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"The middle class, although they apparently washed their hands and feet daily, usually made do in the 1860s with one big bath on Sunday night, in which the whole household took part, perhaps because it was such a nuisance to boil all that water."
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"Partly this was due to a lack of readily available water."
These selections highlight that multiple members of a household used the same bathwater, indicating that bathwater was indeed a shared resource during that time.