When a bunch of men from different backgrounds are put together there is a vast difference in habits, living with people, routine and living conditions. The job of the training sergeant is to get them all following the same routines and discipline. As you will have read, the main priority was to get their weapons drills up to par with the regular army, but training goes far deeper than just that.
You have to get the loner used to living with others - usually thirty to a room or tent, with all their possessions in just one backpack. You have to get the family man - the head of the household (allegedly) - now looking after himself, as well as the 'babies' learning that there is no one to help. Hygiene is important, but hygiene THEN was not as it is today. Baths were almost unknown as were showers. Hands had to be washed but there was often little water available to do that, the latrines rarely had any. Brushing teeth was rare too, the best being achieved with a chewed twig! Country folk tended to be cleaner, but not always. Much depended onthe family and upbringing.
That is why a strict routine was imposed from Day 1 - any deviation was punished in some way. It was followed to the letter. So now we have a bunch of guys living together - good old communal living. Contagious diseases tend to strike after a time, some quite upsetting and some that just appear. This is when you find out what bed bugs are - and what they do to you, just like lice and those inscets that LOVE humans. You also find out what others do when they are in bed - strange sounds in the night! You wear uniform all the time, no choice there either, and probably a strict washing routine both for personal cleanliness and clothes.
Here is where OUR generations differ from those of 1860. OUR doctors tend to know what they are doing, and we denigrate the doctors of those times, but they too knew what they were doing. They just went about it differently according what they knew and what they were told was 'normal'. There were few antibiotics, herbs and tree bark were not unknown as wound dressing. Anesthetics were known about but were either discounted or simply not available. There were no dentists, apparently the only recourse for toothache was a visit to the smith or the farrier, a few shorts, and then get it pulled out.
That is why I explained latrines, etc. It is something quite strange for those of us unused to these very basic measures. I ran into some in my army years, but I have also studied photos of towns and houses in the 19th Century and it is quite amazing just what was photographed that cannot be easily explained today.
Although no particularly relevent timewise, here is a photo taken about 1910 from my part of the world, Whitby Yorkshire - Captain Cook Country, which shows the 'arrangements':
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The row of doors at the left are for the privvys used by all whose doors open onto those steps. I tis back to back with the privvys in the other yard. The box on the wall is the communal water tap. This is much improved from earlier days (pre-1860s) as it was strictly one family per floor and those doors on the right used to be the privvy for each dwelling, and each front door was reached by a wooden walkway on a gantry from the steps hence the distance of the 'cottages' from the steps. The tap replaced a pump and trough. (This is not 'Well Yard' as such but a yard called 'Dark Entry'! The privvies were built in the center of the original Well Yard) It no longer exists due to redevelopment 1959-61.