Sunnats and aadaab of wudhu

Q: If one’s limb is dry after making wudhu and one is unsure if the whole feet or face was washed and one read salaah with that wudhu, does the salaah need to be repeated?

Q: What is the correct method of gargling the mouth for Shawafi?

Q: In wudhu, if sometimes we wash all the parts one time instead of 3 times, can we offer salah with this wudhu?

Q: If I wash my feet for wudhu by putting my feet in an empty bucket and pouring water on it and then wiping it. I do this 3 times for each foot. In-between the times that I wash my feet, my feet touch the water in the bucket that has dropped off my feet. Is my wudhu valid?

Q: Is it permissible if we wash all parts (limbs) in wudhu one time?

Q: I’ve heard from someone that it is impermissible to reuse water for wudhu, however if someone lets the water from the tap run over his arm such that only one side of the arm is being directly hit with the water and the other side is getting wet by the water flowing over the arm, then will this be a valid wudhu?

Q: What are the virtues of using a mudd when making wudhu or ghusl? Are there etiquettes of using a mudd?

Q: Some books mention that one should recite Surah Qadr after wudhu. Example Talimul haq, practical salah by Talimi Board.

Q: A person has a medical condition where water fills in his legs. He has to wear a stocking/sock that is very tight. This sock helps mitigate the condition. It is very difficult to take off and put on the sock.

In this situation, will it be permissible to make masah on these socks in wudhu?

Q: When making wudhu using a mudd, what is the preferred sunnah method, does one throw the water in the palms and then use it for each limb, or can one merely submerge the hand in the utensil and use it that way, after washing the hands first?