Bismihi ta'āla

Ignore these intrusive thoughts. What ignore means is dont repeat. Whatever the circumstance may be, to avoid developing waswasah, dont repeat. This is your fiqhi duty.

And Allah knows best

Bismihi ta'āla

You are travelling, and will be there for less than 10 days, so you cannot fast or pray full. Only when you are in the Holy Haram, you can pray full.

Men should do the ihram evening time, and catch the train after that, so it is at night.

And Allah knows best

Bismihi ta'āla

No, it is not permissible for you to sit at that table, if  alcohol is being consumed at the table.

You have various options, to either decline from going, asking to be seated at a non-alcohol table, etc.

And Allah knows best.

Bismihi ta'āla

If it is water resistant, you cannot do wudhu with it. As for a fake tan, as long as it is not "water-proof", you can do wudhu over it.

The criterion is water reaching the skin, for wudhu and for ghusl.

And Allah knows best

Bismihi ta'āla

If the signs of blood is not that of haydh, it is istihadha.

And Allah knows best. 

Bismihi ta'āla

This is interestingly a "new research", accommodating to today's popular trend. 

Cannibalism is also common among animals, even their own babies. A lot of animals eat their own excrement, or self-mutilate, chewing off their own limbs. Some animals kill their partner, once mating season is finished. 

A lot of animals are monogamous for life. There are animals that can change sex, or are two-sexed, and there are animals that don't need to mate to reproduce. 

The point here is that the argument of comparing human behaviour to animals is a very weak argument, and does not justify anything.

And Allah knows best