Try going to Iraq and spending a year serving your country.
You would drink from a toilet without care if you saw the lifestyle for the people of the country, better yet the way we lived. I mean, we didn't live to bad, but I would probably do more than most now and not think twice.
Germ freaks are an epidemic. Just wash your hands a few times a day, and you will be fine. Vitamins are wonderful for one's immune system.