Water falling on one's feet while washing

Q: Sometimes when using washroom there are back splashes at weird places which are difficult to wash like the sides. I try to wash those places after I am done but sometimes while washing the water falls on floor and on my feet. Is this water impure? Do I need to wash my feet and floor? Will I be impure and spread impurities? Also when using toilet if there are some impurities on the seat or shower, can I clean it by wetting the tissue and wiping it and then wiping with dry tissue because if I pour water, the impurities will spread on the floor making the floor napaak.

Observing purdah with ghair mahrams

Q: Must a male observe hijaab from the following?

(1) Ghair Mahrams that are past child bearing age.

(2) Ghair Mahram relatives that are past child bearing age.

(3) Ghair Mahrams that have mental illnesses.

(4) Ghair Mahram relatives that are married.

(5) Female Mahrams whose satr is exposed, like his mother, grandmother or aunt.

(6) His biological grandfather divorced his biological grandmother. The biological grandfather marries another women. Must hijaab be observed for this woman, the new wife of his biological grandfather?

(7) Female domestic workers in the home.

Doubts with regards to the ingredients in the noodles

Q: During dinner in my hostel Chinese noodles were being served and even chapati was being served. The guy who serves the noodles serves the chapati too. So my question is will the chapati be haram and napak if that noodles had ajinomoto in it? I don't know whether they add ajinomoto to it or not and even if they add it may also be halaal but I don't know whether they used it or not and even after eating the chapatii with curry my mouth got oily and I drank lots of water and I cleaned the lips and that area for like 10 to 12 times without a single drop of that water falling on me but again sometime later I felt oily on my lips so I ignored it and rubbed it with my hands and touched my pants so am I pure?

Taking possession of the gift

Q: Zaid, Umar, and Bakr are friends. Zaid has an item in his hand and asks Umar, "Umar, do you want this?" Umar replies in the affirmative. Zaid then places the item on the table in front of him. Umar leaves the room without the item. He intends fetching the item later on. Bakr is not aware of all this. Later in the day, Umar sees Bakr going home with the same item. When Umar asks Zaid about this, Zaid replies: "You did not take physical possession of the item. I thought you never want this gift. That is why I gave it to Bakr." Umar objects saying that he responded in the affirmative when Zaid asked if he wanted the item.

1. Who truly owns the item?

2. Is it true that since Umar did not take physical possession of the item, it still belongs to the original owner, Zaid?

Changing one's niyyat before the fast commences

Q: I made a niyyat for a nafil fast about 30min before sehri ends. Just prior to sehri ending, I decided that I should rather wait and make the niyyat for keeping fast before half the day, depending on how I felt. I was not going to eat during that time, until my niyyat was confirmed. Is it ok to change my niyyat for fasting afterwards, or is the first niyyat I made 30 minutes before sehri ended binding?