Food

If you are sure that an item is Najis, you must avoid using it in your Prayers. If you are not sure that it is Najis, you can consider it as Taahir unless you want to practice Ehtiyaat (precaution). 

Wassalam.

Ahlul Bayt (AS) who were captured after Karbala had carried with them their own grains and did not take from enemies any food.

Kafir is every non believer in Allah (SWT) and the Prophet (SAWA).

'Wassalam.

We have in some books that some of the companions of Easa (AS) were not grateful to the bounty of Allah Who Sent to them a table of food from the sky for them. Sura Al-Ma'idah, verse 115 mentioned: Allah Said: I am going to send it down unto you, but if any one of you after that disbelieves, then I will punish him with a torment which I have not inflicted on anyone among all the mankind).

Wassalam.

If you are not sure that the food was been touched by a Mushrik with wetness, then you can take as Taahir, but if you are that it was definitely been touched by a Mushrik with wetness, then you must avoid consuming it.

Wassalam.

Yes they are allowed to cook but with out touching the food with wetness. If they are from People of Book (Ahlul Kitab), then many if our great scholars consider them as Taahir.

Wassalam.

Not every Haraam food is Najis, although every Najis food is Haraam, but many Haraam food is not Najis like fish without scales, shells, crab etc. Najis food is like pork, meat of animal killed in wrong way, and any food which was touch with witness by a Mushrik or Kafir.

Wassalam.

It is not allowed to consume any food or drink which contains intoxicant alcohol.

Wassalam.

Hygiene is very important in our life and we never ignore hygienic requirements relying on anything else. After applying hygenienic requirements, it is good to recite Ayatul Kursi and Sura Alhamdulillah Rabbil Aalameen on food.

Wassalam.

Feeding Kaffara must be given as food to poor believer and not cash. If you don't have access to ooor believers where you live, you can send the Kaffara to other places where poor believers can be fed.

Food banks usually give food to public with out the condition of faith, that is why, it is not allowed to give Kaffara to them, but you can give them general charity or donation for feeding general public.

Wassalam.

Whispering of Shaitan does not need his physical presence in front of us, as Shaitan is able to whisper to us from far and we don't see him. Shaitan whispered to Adam and Eve and Talal oath that he is advising them for their benefit. They never thought that anyone can take a false oath. They did not commit any sin by eating from the tree because they were never been ordered but just been advised. Doing against an advice is not a sin but it was better to avoid it.

'Wassalam.

Kaffara of breaking an with is feeding ten poor believers or clothing them. Feeding  must be given in food not cash, to poor believers. It can not be given to food banks who give everyone from every faith. You can give the amount to any trusted Muslim charity or person who buys and distributes food for poor believers only.

Wassalam.