I still have access to this old doctors office. Albeit its in norcal. But, its up there on the creepy factor.
The kit that you're looking at is an injury kit. While it's practical for wounds, you would be better off getting some white (clown type makeup) and using that in addition to the injury kit, then accenting the actor's faces. That's what we did for a shoot I worked on, and it just got a 4 million dollar budget. :D
http://graftobian.com/commerce/product.jsp?prodId=464&catId=13 this would be a good kit in addition to what you're looking at. Don't put too much, but enough that it makes them look pale. Oh and don't forget their necks, ears and hands/arms. Nothing worse than seeing a zombie with a perfectly white face and the rest is tan. :) Hope that helps, and hope you feel better! (Had my gallbladder out too, not so bad)