Ruqyah

You must not ask for such permission. Go ahead and recite it.

Ruqya is for healing from illnesses and not for protection. Protection is done though reading the Athkar. Kindly refer to the following link(s): https://www.assimalhakeem.net/what-is-ruqyah-and-how-one-should-do-it/

The verdict is for those who ask for ruqyah to be done on themselves. You can do it on yourself and also on others without any problems.   https://m.youtube.com/watch?v=6pXuaFZ3h48

You should continuously recite ruqya and number of times per day and night.

Due to lack of time, I do not give reference. It is permissible to recite over water and let others drink from it. You can also do this by not telling him.

They must start ruqya without trying to find out what it is.   And here is how to do it: https://www.assimalhakeem.net/what-is-ruqyah-and-how-one-should-do-it/

There is no harm in drinking and bathing with water which Quran is recited over.

https://www.assimalhakeem.net/how-do-we-protect-ourselves-from-black-magic-evil-eye-envy/

No, this is not permissible.