I have had some unpleasant Montezuma's Revenge type experiences with uncooked vegetables in the past, and the way I've dealt with this situation is simply to avoid eating fresh vegetables.
However, my next trip to Mexico will consist of four weeks in Oaxaca City, one week in Huatulco, and one week in Mexico City, which for me is rather too long to go without salads, plus I would like to feel free to try tlaludas, etc.
With drinks, I've learned that it's generally safe to drink cocktails, etc., in upscale restaurants, and elsewhere to ask if the ice is made from agua purificada.
Is the situation similar with raw vegetables? Are they usually okay for my gringo stomach in upscale restaurants? And elsewhere, how do I ask if the veggies have been washed in water that won't cause negative repercussions?
Thanks so much.