Impurities

A few questions regarding purity

Q: I have a few questions regarding purity. I would appreciate  a response.  I am subject to whispers from Shaitain, and want to understand these matters properly so I can confront this issue.

  1. How can one use water to clean themselves after defecating in a modern toilet without getting splashes of water on themselves?  I place toilet paper in the water, but water still splashes onto me.  I often shower the lower part of my body after defecating to be precautious, but I am torn between the feeling that I am wasting water, and doing something most people don't do on the one hand, and the desire to be clean without doubt on the other.
  2. To clean a garment that has urine or sperm on it, is it sufficient to wash under a lot of running water a sufficient amount of time, or must  it be washed and wrung three times?
  3. When cleaning clothes with najasah on them in a washing machine, what if drops of water from the first cycle splash onto the inside roof of the washing machine, and then those drops of water fall back into the water during a later cycle.  Will these drops of water impurify the clothes?  Is this excessive detail?
  4. If someone has wet feet and they walk on carpet or slippers on which there is something impure, is the impurity considered to have transferred onto their feet?{C}

The Private Organ Touching One's Underwear Without Washing

Q: If one urinates, then he does his best to release all remaining drops by pressing under the scrotum and squeezing the private organ few times, thereafter he wipes the front of the private organ with a dry tissue. Then he wraps a tissue around it. Now the person sleeps and when he gets up he sees the tissue was scrolled away during sleep and the private organ did touch his underwear. Is his underwear considered impure? i.e. if the private organ is wiped off with a dry tissue without washing, and the dry private organ does touch the underwear, is the underwear impure?

Touching a Pigskin Leather Jacket

Q: If one touches with ones hand or clothes for example a pigskin leather jacket, does his hand/clothes become impure? If one is praying and someone joins the saff who is wearing a pigskin leather jacket, and during the Salaah the pigskin leather jacket does touch the person for a duration of one rukun does his Salaah become nullified?