These are the opinions that I have received.
1) No
2) Yes
I don’t do it, though I was told that if you pour out the entire contents immediately and throw away the can, it is muttar. otherwise it becomes a kli, and you may not make a new kli on Shabbos. It’s so much easier (and cheaper) to either open a soda bottle, or drink water. Personally, my Shabbos drink of choice (really choshuv to me) is a large bottle of ice-cold Diet Peach Snapple. There is nothing better, IMO.