Simple: Juice of two fresh limes w/ a "generous" pinch of salt. Mix, then down it like a shot. You should feel "Much" better within 2 hrs, if the mixture doesn't alleviate your symptoms withing 6 hrs, then repeat.
Also a few tips to avoid it:
- Integrate yogurt into your diet daily for a couple of weeks prior to your trip. The "good" bacteria in the yogurt will combat the "bad" bacteria you may intake in Mexico
- Use the dispenser water, (these are everywhere, including most public restaurant bathrooms), or bottled water for EVERYthing, including quick hand washing for meals and brushing your teeth. Wash your hands often, and carry some anti-bacterial gel with you.
- Charcoal pills. These can generally be ordered online as well as acidophilus, the old standby to help your body combat any bacteria introduced to the stomach.
- Many locals also swear by drinking Guava juice for "icky" tummies. Its reported to "work like a charm". Also much easier to tolerate than lime juice, though possibly not quite as effective.
- Grapefruit seed extract.
- The ever popular Immodium. Though this does nothing to "cure" the bacterial infection, it does mask some of the more unpleasant symptoms.
- Pepto- not always effective for everyone, it coats the stomach. Its advised to use something else to actually combat the bacteria in the system.
- The "official" Revenge comes with fever as well as the diarrhea. Diarrhea alone may simply be your body adjusting to different diet and overindulgence. This happens a LOT with the advent of all inclusive resorts. Normally, this adjustment period will last only a 12-24 hrs. True Montezuma's Revenge takes hold and can last up to 7 days.
Hope this helps!