Ahm no actually. The prisinors had a calorie intake of about 800 calories per day (some sources claim 1100 to 1300 calories but that doesn’t fit my narrative) while working the entire day. Theft was a regular occurrence. So sometimes you would have even less than that.
A common result of that was diarrhoea. Because sanitary facilities were usually only added after years the prisoners slept in diarrhoea drenched beds. The medical “care” wich was also often added only very late and according to the buchenwalde memorial “only because of extreme pressure” were used as an opportunity to kill prisoners by injection.
Most camp prisoners were not what I would call criminals. The common categorisation charts list political enemies, Jews, homosexuals (most of the time only male homosexuals), jehovas witnesses and Asocials (people that did not work).
Unfortunately I don’t know anything specific about the drinking water situation, but the memorial buchenwalde as well as mittelwek-dora and ausschwitz state that water was sparse.
You could have picked any example of concentration camps to make your pointless argument, but you chose to talk about the nastiest crime in human history.