Just got back from a trip to Brazil.
I ended up putting it in a (very well washed out) empty Rogaine bottle.

Hey... don't laugh. The stuff is alcohol based so if they did open it... it pretty much looks and smells the same. It also has a 1ml eye dropper... so.... it's a complete disguise kit in one.
It worked perfectly.
I also took just enough for the trip... so that I could rinse the bottle there... and coming back home was a NO risk. When I got back to the states... I put the Rogaine back in... and I was all set.
Seems like a bit of work.
But... getting out of jail might have been worse.