Factors that break and don't break the fast

Forgetfully eating while fasting

Q: I have started qadha fasting of my previous fasts which I did not make up in time. Today accidentally in morning I forgot that I am fasting and talking to my friend she offered me sweet and savoury and I tasted some of both. I did not even remember after sometime that I was fasting when during conversation I told her I am fasting nowadays and realised that I was fasting and have eaten by mistake. I know in Ramadan you can continue the fast but I don't know if it applies to qaza roza as well. Please tell me if my fast is valid or do I have to do anything else?

Water entering the ears and using deodorant while fasting

Q:

1. While fasting, if a person takes a bath then, will the water entering the ears break the fast?

2. During wudhu, while doing the masah of ears, when we put our finger in the ear, will the water entering our ear break the fast?

3. After bathing will the use of deodarant (both spray and roll on) break the fast? Because it is said that the pores of the skin are open after bathing and the deodrant enters the pores thats how the smell comes when we sweat. 

Using scented tissues and Makkah oil while fasting

Q: I have two questions:

1. During Ramadaan, while fasting I had a terrible migraine. I applied Makkah oil (green box medicine) on my forehead. Would the smell break my fast?

2. In Ramadhaan, while fasting I was in Australia. I had a running nose and used something like a Vicks scented tissue. I didn't know it was scented. Then I was confused where the smell came from so I blew my nose again. Only then I realized it was from the tissue. I think I could feel the smell going down in my nose. Is my roza accepted or must I make qadha?

Fasting while travelling

Q:

1. I have read that one can only miss his fast if one is a traveller at sehri time. What will be the ruling of an individual who is travelling abroad but his  light is at afternoon time (meaning he is still at home at sehri time)?

2. If that person needs to fast, how will he do Iftar because different countries have different iftar times.

3. Also, will putting Vicks under the nose and sniffing it throurg out the day break one's fast? I have read that it doesn't because it does not have a body. Will that have the same ruling if one was to sniff Vicks from a tissue (i.e. putting some vicks on a tissue and then inhaling the subtance form the tissue?

Breaking the fast through masturbating

Q:

1) If a person intentionally keeps masturbating and ejaculating during whole ramazan since he fasted 1st roza of his life so will masturbating and ejaculating broke his roza?

2) If rozas have broken due to masturbating will he have to done qaza for each roza or he will have to pay kaffara for each roza?

3) What is the qaza and kaffara of one broken roza intentionally?