Good luck if you think you can 'prepare' your stomach by pre eating sub standard food or dirt or whatever. You're more likely to go down with something severe enough to postpone the trip than end up with a cast iron constitution.
Other than that I don't think there's much you can do other than taking hygiene seriously and hoping it's your lucky day. Because sooner or later, and if not this trip then the next, something will get you when you least expect it. Mostly, my odds say anyway, it'll be mild and you'll either live with it or get over it quickly, but occasionally it'll be severe enough to cause you issues (delays or a need for medical care) - as I found this summer.
Take a (good) supply of the diy remedies (imodium in my case) that you're most likely to need, hope that over zealous customs officials believe the contents of your first aid kit are all for your 'medical condition' and check your medical insurance covers you for more professional help if that's not enough / it's all confiscated. Buying stuff over the counter in a pharmacy in a foreign land isn't easy when drug names for the same active ingredient vary and you don't know what to ask for.
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