If you're going for dead-on, you'll probably need to sew that first-aid kit from scratch. It's a vinyl fabric, the same stuff used for kites and parachutes. Some quick google image searches got me this: http://www.priceinspector.co.uk/p/li...t%20aid%20kit/
it looks like the lifesystems brand is UK only though.
Ibruprofen is available anywhere. The photo in question looks like Target-Brand
The "Bile-Bomb" made me smile. They combined features of a medical specimen jar and a canister grenade. The pin used is called a "cotter pin" which you can get from the hardware store.
It's tough to find clear straight-sided jars in any material other than glass. I'd reccomend avoiding glass for cosplay. Making the jar from stock tubing would get you the clear appearance, but buying a translucent jar from a supply shop will reduce the risk of leaks.
I have seen tupperware that has that general texture for the top, but it might be hard to find, especially in the appropriate dimensions. I think I'd carve the thing out of a hunk of balsa or basswood, but I'm a bit nuts.