Finding impurity on one's body after istinja

Q: Please can you help me with the following?

1. Yesterday after passing stool I showered and cleaned myself to the best of my ability. Later that day when I cleaned myself in the toilet I found my private parts were still a bit dirty. I am now concerned that due to the fact that I showered and dried myself i could have spread the najaasat all over my body and therefore wherever i sat during the day and possibly perspired could have become napaak. Please let me know if this is in fact the case and whether I have to go back and wash all the areas i sat on during the day, including my towel shoes etc

2. Sometimes after cleaning I notice a dead insect on the cloth that I have cleaned my house with, would this then make all the items I wiped with that cloth napaak and is it necessary for me to wash these items three times?

3. We were out at a restaurant with family and friends and when we got home I realised that my daughter had urinated in her pants. I then began to get concerned that she was sitting on the chairs in the restaurant and touching everything there including the food, utensils etc. Furthermore she also sat on our family and friends laps and touched their belongings. I am not sure how wet her clothes were at the time and whether the urine has made all these things napaak. Please can you advise me as to what to do in this situation.

Kissing the thumbs at the time of Azaan

Q: Some people claim that it is mustahab to kiss the thumbs and place them on the eyes at the time of hearing the blessed name of Rasulullah (sallallahu ‘alaihi wasallam) in the Azaan. They substantiate and prove their claim through narrations mentioned in the following kitaabs; Musnadul Firdous, Kanzul Ibaad and Fataawa Soofiyah. What is the correct shari ruling in this regard?

Using recycled water

Q: The residential area I stay in is now using recycled water. This water is apparently derived from sewage water. Although they have claimed that the water has undergone stringent purifying processes and is currently safe for human consumption, it is noticeably different from what it used to be before the drought. My question is, knowing full well the apparent source of this water, in addition to consumption, is it jaaiz to use such water for wudhu and ghusl? If not then what is the alternative considering it is very impractical to purchase large amounts of water or even instal a borehole.