If he broke the intention of fasting and decided to break the fast, even if he did not actually break it, his fast is void and he has to make it up. However, he should still refrain from the things that break the fast – such as eating and drinking – for the rest of that day. He does not have to pay kaffara.
The term â€œTeweffaytaniâ€ that is mentioned in the verse does not mean death. It means finishing the time that Allah has assigned for his link to earth since after such time has elapsed, Almighty Allah raise His Prophet to the sky.
The scholars of the Shia school of the thought unanimously agree that the qunoot is recommended in all obligatory prayers. This is proven by many narrations of the Imams (peace be upon them), and it is narrated in some narrations of Sunnis as well.
It is not possible for non-expert Muslim to find out the most knowledgeable and God-fearing, he should refer to the experts to determine this. If you could not ascertain the most knowledgeable, or the most God-fearing, based on what the experts inform you, then you can choose one of marjas and follow his edicts.