There's a big thread full of Left 4 Dead on this very forum: http://www.cosplay.com/showthread.php?t=165951
The image you have for the pipebomb is pretty small. It looks to me like it was made from a power strip.
You could either sew the bag or look in thrift shops for a similar bag and modify it by sewing on those medical patches.
The pill bottle should be easy. Get a pill bottle and make a new label for it.