Such a great post chock full of great advice! I didn't know about latin america vs asia in terms of food borne illnesses - this is really helpful.
I've been sicker than a dog from a visit in Mexico (no street food, just something random) and the worst was in Egypt when I made the mistake of getting addicted to the falafel cart near my hotel. It was absolutely delicious but I was ill in every way for over a week. Thankfully a traveler gave me a homeopathic that helped. Actually, I had an all around nightmare travel experience in Egypt since I was bitten by a dog also and saw the insides of hospitals from Aswan to Luxor which was it's own shocking experience for me in 1989. Anyway I digress!
A year ago someone gave me some colloidal silver in liquid form and I knew it was good for the immune system but I didn't realize it could be used in this way - great advice. I use coconut charcoal every time I have any kind of digestive discomfort and it's the magic cure!
The good thing about Egypt in the 80s was that the political situation was much better for an American traveler so i'm glad I went (from this vantage point LOL!).
Also also also, I can't believe I forgot to applaud your impressive in-hotel creations! Those look marvelous and I'm sure they taste even better - very creative and resourceful Dan. I was taken with them when I looked at this post but I neglected to mention it because of the colloidal silver mention. And btw, I think you're right that it's big pharma preventing it from being prescribed/recommended. Really great post!