This is one of my major worries with my husband as well. So far though, thankfully he's not gotten ill when we've been away from home. Before I go anywhere on vacation I read about the medical facilities there, and also try to locate hospitals, just in case. We've made the choice to vacation mostly in the US and in some parts of Europe, where I feel confident he can get good care.
Also, before we head too far on vacation, I usually get some scripts filled from him GI (for steroids, antibiotics). Also, his GI is nice enough to give us his cell phone number in case of an emergency, so at least we can get a phone consult, or let his attending physician consult with him. We've never needed it, and I'm glad for that.
Also, just to not throw his routine and tummy into chaos, I try to control his schedule and eating as much as possible. So, if we go on vacation, instead of staying at a hotel and eating at restaurants, we get a cabin or rent a condo or something, and cook at eat there, and pretty much stick to the same routine as home, and make sure he gets plenty of rest.
Yes, it sounds boring to just not let go and do whatever, but in our case, this has worked for us, and we also have fun on vacation - while also remaining cautious.
But ultimately things really are not in your control, you can just give yourself the best fighting chance of having an enjoyable trip. Don't let this disease ruin your life; just take precautions (don't go to places that you know doesn't have decent healthcare, don't eat or drink anything if it isn't safe, and all the usual common sense precautions), and that is the best you can do.
Husband with Crohn's
Diagnosed March 2003 Ulcerative Proctitis
Diagnosed March 2008 Crohn's & C-diff, hospitalized 45 days
Crohn's in Remission since June 2008
C-diff recurrence Sep 2009
Reactive Arthritis Nov 2009
Currently c-diff free
Osteopenia of spine (Mar 2010)
Canasa (1gm), Lialda (4.8 gms), Remicade (8 weeks)
Currently In Remission