I can’t speak to practices on sailing ships, those surely differ from general history especially when it comes to fresh water which isn’t freely available on the ocean.
And to your second point, in the context of history that happened in modern times. The cholera epidemics happened in the 19th century with the epidemiologist John Snow publishing his treatise in 1855. Unsafe drinking water causing widespread disease was mainly a problem of modern cities in the industrial age and the overcrowding and unsanitary conditions that came with it.
I can’t speak to practices on sailing ships, those surely differ from general history especially when it comes to fresh water which isn’t freely available on the ocean.
And to your second point, in the context of history that happened in modern times. The cholera epidemics happened in the 19th century with the epidemiologist John Snow publishing his treatise in 1855. Unsafe drinking water causing widespread disease was mainly a problem of modern cities in the industrial age and the overcrowding and unsanitary conditions that came with it.