If you will still have the same health insurance while you are away, you should call your insurance carrier and ask them if they have a mail order delivery program. A lot of places will let you order a 90-day supply at once. You could also ask about a vacation exception to the 1-month rule. Some insurances will let you get more than the one month if you are going away. So this could give you a head start on your year's supply.
The other things I would ask about are whether you have pharmacy insurance coverage outside of the country. If you buy the drug yourself and file a claim from abroad, will they reimburse you?
I would look into how much Asacol costs where you are going. A lot of countries are not as rigid as the US are about prescriptions and would probably honor an American prescription. I've paid nearly nothing for some drugs in Europe that here in the US cost about 3 times as much. So paying for it in India, for example, might just be simpler and easier than trying to figure out whether someone can send you the drugs. At the very least, I would ask my doctor for a bunch of prescriptions to take with me. Personally, I fill a prednisone prescription before I travel so that I have one vial of it with me in case of an emergency.
No matter where you go, you could always find a local physician to prescribe Rowasa, etc. if you need it. But before I did that, though, I would talk to local pharmacist to make sure that what you want really requires a prescription. I got antibiotics and cortifoam without a prescription while I was traveling just by asking for it and obviously looking like I knew what I needed! It was strange, but very convenient.
UC for the last ten years
Current Meds: 6MP since 2006, Lialda, Asacol foam
Past Meds: You name it; I've tried it. (Asacol, Colazol, Pentasa, DiPentum, Rowasa, Canasa, Cortenema, sulfasalazine, Cortifoam)
Alternative treatments I have had success with: Acupuncture, Hypnotherapy