All you have to do is put it in a zip lock back along with any other liquid under 3 oz and then u gotta send it through the x ray machine with the rest of things in your pocket. I did it on several plane rides and it was fine.
It's not THAT easy to find in stores. I flew down to LA and had the security lady pitch my can b/c it wasn't in a clear plastic bag. I went to a bunch of drug stores down here and couldn't find it...and when I did, it was $25 a can...wtf. A year's supply is only $136 or so
I took a bunch of knives on a plane. They just made me check them into the cargo service.
I also took gold fish on a plane. That was breaking the rules. Their container leaked inside the X-Ray machine. I appologised profusely for not sealing my water container. They lifted it out of my backpack, but not far enough to see the fish. They gave me a thurough pat down and search after that, though.