I was in Singapore and Malaysia for a little over 2 week last year and had been on 500mg test-e leading up to my departure. I continued the dosing as I normally would (250mg 2X per week), and then the day before I left I took 500mg in one shot. Resumed when I got back into the US. Continued feeling the way I had felt for the entire cycle, didn't get any crazy side effects that I would attribute to fluctuating blood levels. This was my strategy.
Also, if you're traveling around Europe or Asia, you can always try to stop into one of the countries where AAS are still legal to purchase it over the counter...just saying.
I would be interested to hear from members, however, what they would do if they planned to be traveling for a good month or so.