Ask your doctor to write you a prescription for antibiotics so that you can take the antibiotic with you. If the worst happens, treatment can begin right away instead of trying to find a doctor/pharmacist while the symptoms are still underway.

Bring a small electric pot capable of boiling water in case you need to brush your teeth/have a tea/etc and there's no bottled water you trust.

Close your eyes in the shower. Don't even rinse your mouth with water from the sink/shower.

Look for thoroughly cooked food.