Just read most of this blog and am awed by the erudition of the posters. As patur aval assur writes: for once, a civil and instructive discussion.
However, to Avi K: opening a bottle is a “doraisa”?? Do you mean a regular beer or mineral water bottle?? That cannot be. Do you mean opening the top and breaking the metal cap? please elucidate because your statement- as said- is incorrect.