Is it permissible to send students to fetch water from a place far from the residence, or is that considered an injustice and exploitation of them?

The teacher should not use students for personal interests because he receives his salary from the school administration. However, it is permissible to use them if they do so voluntarily and charitably, without compulsion or fear, provided that it does not cause them hardship and that those who participate are not given preferential grades. If someone is available to fetch water for a wage, that is safer. It was also the practice of the predecessors not to benefit in any way from their students.