Actually, it doesnt really show. I just went back and it doesnt show however it is implied. He could have easily put it on that table before Lydia came. 1) Only 1 packet on that table 2) He knows her schedule and where she sits. Pretty easy.
SUCH a satisfying ending!!! i'm in the camp of, love walt no matter what, and so it was great to see him going out peacefully after such a glorious nazi killing scene. loved jesse killing todd, loved jesse getting away, loved the snipers and walt hiding in skyler's kitchen....loved pretty much every second of the episode. AHHHHHHH greatest. show. EVER!!!!!!!!!!!!!