Food

If the food has animal ingredients, you must be sure that it is Halal before  consuming it. Animal ingredients are not allowed for eating before being sure that it is Halal.

If the food has no animal ingredients, nor alcohol, and you don't know that it has Najis ingredients, then it will be allowed for you to consume it.

Wassalam.

It is allowed and not Haraam, but just Makrouh (disliked) to eat in the bathroom. If there is a condition forcing you to eat in the bathroom, you are allowed to do so.

Wassalam.

Non Muslim seller who claims that the meat he is selling or wants to sell is Halal can not be taken as an authentic evidence that the meat is really Halal. If Muslim tells you that his meat is Halal and you have no reason to doubt his statement, then you can take the neat as Halal.

Restaurants selling alcohol or pork can never be trusted as utensils and plates used in cooking or serving alcohol or pork  become Najis and and every other food put in Najis utensils and plates becomes Najis as well.

Wassalam.

Usually we deal with questions related to practical issues which people experience in their day to day life. Your question looks like very far from day to day life, nevertheless if you want the answer for knowledge, it is obligatory to save our life. Deliberate failure in saving life and causing death is a sinful act. It is not permissible to cause death to yourself even if the only food available to remain alive is pork, but no more than what make you survive.

'Wassalam.

We are been advised to eat less and leave the food when you are still feel wanting to eat more. That will then leave space for drinks and breathing. It comes from your personal experience which makes you able to estimate the one third for food and the other third for drinks and the last third for breathing properly with out feeling full or heavy.

Wassalam..

If the meat was slaughtered in any Muslim country by Muslims, we can take it as Halal. Many multinational food companies bring meat from non Muslim countries to sell it in their branches in Muslim countries. Such meat brought from non Muslim countries is not Halal unless there is an evidence that it was slaughtered by Muslim according to Islamic rules.

Wassalam.

If you were sure that the real Fajr has happened then you ate even after one second after Fajr, your fast will be invalid. If you ate because you were not sure whether Fajr has happened or not and you ate thinking it did not happene yet, then your fast is valid.

'Wassalam.

The company must not sell pork nor alcohol. Cigarettes business is unlawful according to many scholars. You need to refer to your own Marje' of Taqleed in the matter of cigarettes and seek his verdict in it. Accordingly you will know whether it is permissible or not to invest in such company.

Wassalam.

It is not necessary to take it as Najis unless you are sure that food was touched with wetness by a Najis hands. Food cooked with out been touched or by wearing gloves is not Najis.

Wassalam.