Ramadhaan & Fasting

Q: What is the maslah with regard to keeping a nafil fast on a Friday? Also is the ruling different if a qadha fast is kept on a Friday?

Q: The three fast for breaking a qasam have to be fasted together or with intervals?

Q: A relative of mine came from overseas for holiday. The wife carried hot water in a flask for the child's milk. At the airport in England, they asked her to drink the water (to see whether it is really water on something else). She explained that she is fasting. They said either she drinks little of the water or they will have to throw the water away. She therefore drank some of the water. Will she have to keep only qadhaa, or kaffarah as well?

Q: I was reading something on one of the islamic forums on the net. They were talking about their musjid not having facilities for women’s I'tikaaf. When I mentioned that as far as I know, women are supposed to observe I'tikaaf at home, a lady replied: If a woman wishes to perform i'tikaaf, then she should do so in a masjid, so long as there is no danger in that (such as free-mixing and complacency regarding the hijaab, etc). Please explain if this is correct.

Q: I would like to keep all my fast in Ramadhaan. Am i allowed to take a contraceptive pill for the month, to prevent me from getting my period?

Q: As a teenager I had a bad habit of masturbation, which I sincerely and deeply regret. The urge was very strong and I resorted to this sin even in the month of Ramadaan while in the state of Roza. I would keep the fast as usual, i.e have sehri, and abstain from food and drink until the time of iftaar, but on one occasion would commit this heinous sin. May Allah Ta'aala forgive me. Ameen.
This evil continued for approximately 8 - 10 yrs since I became baligh. Thereafter Allah Ta'aala assisted me to refrain from this sin. Alhumdulillah.
It is a source of constant worry for me, and I know that taubah is not enough to eradicate this evil deed. I know there is qadha as well as kaffarah that needs to be kept. I am however perplexed with how to go about this. My concerns are as follows:

Q: We here in the Western Cape are split on the issue regarding the sighting of the moon for Eid. My wife and her family have Eid with Makkah and my family and I celebrate it with the local sighting of the moon.
My wife’s father is adamant that what I’m following is the wrong thing, I wish not to argue with him because the knowledge that I have regarding this issue is unfortunately very limited. Please enlighten me on this issue.

Q:  Putting Insulin Injection for Diebetes on the stomach when Fasting, does it break the Fast?

Q: If just by the company of one's husband or one's wife (without hugs and kisses) the partner gets wet, is the fast cancelled?

Q: Please explain what is forbidden during the holy month of Ramadhaan between husband and wife?