Shanghai Metro tickets

I plan to buy a Meglev and 24 hours metro pass for my first 24 hours in Shanghai at the Pudong International Airport Meglev station. Can I also buy a one day Metro travel card at this Meglev station terminal for my next 24 hours use ( I will activate it after the first 24 hours in Shanghai).
As well, can I buy a few of this one day Metro card to be used in a week later when I come back to Shanghai. ( for sure, I will activate thrm, one pass at a time upon usage as needed). This will save me time in looking for the ticket counter and buy it every time I need them for the 24 hours use.
Can this Metro bus be used for change from Metro to bus?