Is it permissible to take from the money of a loan to buy drinking water in fulfillment of a vow?

The question is unclear, but if what is understood from it is that the borrower has a usurious bank loan and cannot repay it except with a new loan, so he agreed with a person to pay off the loan for him in exchange for him repaying the amount with interest, and then he took a new loan and paid a part of it to the person, and paid the rest of his money from the loan for a vow he had, then the answer is:

1. It is not permissible to deal with usurious banks, as their transactions are forbidden and involve aiding in sin. 2. The agreement with the person who paid off the loan involved usury because he returned it with an increase. 3. Fulfilling the vow from the remaining amount is permissible and sufficient, as the sin of money acquired from usury pertains to the conscience and not to the money itself. 4. One must repent to Allah Almighty from dealing with usury, as its danger is great and its perpetrator is accursed.