Final answer:
The reason Wiesel didn't want to give his father drinking water was likely due to the fear that it might harm him further or hasten his father's death in their dire circumstances.
Step-by-step explanation:
The main reason Wiesel didn't want to give his father drinking water could likely relate to a concern that in extreme conditions, such as those experienced in concentration camps during the Holocaust, giving someone very ill or on the brink of death could potentially be harmful.
If an individual is severely dehydrated and their body is no longer functioning properly, drinking water might worsen their condition or even lead to a painful death. In Wiesel's memoir 'Night', this kind of excruciating moral dilemma highlights the unimaginable choices individuals had to make to survive.