It's not food poisoning. It's "traveler's diarrhea", the result of drinking/eating unfamiliar things. The water [and foods washed with the water] in foreign countries is "foreign" to your digestive system and you will therefore have a reaction to it. They say it's best to avoid the water unless you KNOW it's purified, as well as ice cubes, etc., as well as raw foods washed in the water [e.g. salad, fruit].
Once you get hit with the "bug" the best thing for it is immodium, or the generic equivalent - much better than Tums, etc. Mouthwash will do nothing to help. Hand sanitizing is no guarantee, but it's not going to hurt anything either.
BTW - Your question would be much easier to read if you used standard punctuation and spelling - and perhaps some paragraph spacing. I didn't read the entire question for this reason, but rather skimmed over it.
Good luck on your trip.