A stent implantation is a simple procedure that requires only a little local anesthesia and does not require general anesthesia. Beau would have been provided dinner as part of his stay, especially considering his procedure was earlier in the morning and it is evening when Maggie brings in the dinner tray.
The shot that Colt orders is called The Five Points. A tornado is something totally different with different alcohol in it.
Beau is seen post-op in his room and has several EKG leads attached to his chest, which is very hairy. The areas where the patches are placed are not shaven, which they would be to get sufficient contact for the lead with the skin.