Folks, After being on a couple of other continents where things like cholera still exist, I can only offer a little bit of "Street sense" about these water-born diseases.
Cholera oubreaks hit the news back in the middle ages when men settled into towns and cities. They learned the absolute most direct transmission of Cholera, back then. It was by drinking from the same source as your own waste found it's way too.
Basically, drinking out of your own toilet.
Cholera is a Sanitation problem.
In 1992, the U.S. had 96 recorded Cases of cholera. Highest number ever recorded in the US. 95 were obtianed from abroad.
So, during the year with the most recorded cases, only 1 case was from within our borders. Cause: bad sanitation.
Fast forward to the 3rd world or today. Very similar. Cholera comes from stanky festering water sources that get filled with human and animal waste.
Not wild animals near as much, as livestock kept by humans. Anywhere there are humans in clusters and domesticated animals in clusters, and the waste runs off directly into the water source, you have prime breeding ground for Cholera and other bad stuff, like worms and parasites.
Cholera, just springing forth in a remote jungle or mountain water source is pretty far-fetched, not that there aren't bad things there, things that can certainly give you mild distress up to very serious problems.
The point seems to be lost on some of us. If you are in a really tough spot, and you are dehydrating rapidly, you may only have 2 choices, drink questionable water, or die. It's very simple.
Having been in that similar sitaution, thankfully only a couple of times, I know that each and every one of you WILL, in fact, drink. You will pick the cleanest looking, you will pick water that is running, if possible, you will use a shirt or bandana as a coarse filter, but you WILL drink it! It is very very difficult to be in the throws of dehydration, and NOT drink available water.
Because if you don't you will die.
It's rock and a hard place.
Drinking may buy you another 48 hours on this planet to seek help, Not drinking may see you DEAD in 6 hours or less.
lLes Stroud and Bear Grylls have both told the audience, on numerous occasions, that it is preferable to boil, treat, and do whatever possible to find a clean water source, but, they are also showing, that, in a TRUE survival situation, you DO what you have to DO, to survive.
That may mean risking some parasites or disease, but you are racing the DEATH Clock, and hoping you can reach safety in time to get medicine to help you should you contract a bug, vs. dying that same night of dehydration, slowly losing your mental faculties, and collapsing, unconcious, then dead.
If Bear and Les were showing Hiking, Camping, BackPacking and they drank untreated water on the show, I would be right there with you, admonishing them. But, the entire POINT of the show is that you are NOT equipped, due to some major malfunction, and that you may have to do some things that you would not normally do in order to survive.
On a normal day,
Most of us would not risk crossing a swiftly running river,
Most of us would not risk climbing up or down a steep embankment,
most of us would not drink from a questionable source,
BUT, in a true Survival Situation, I think each and everyone of us, would risk more (than we would normally if we were on an equipped camping trip) , in order to LIVE.
I also have not heard the correct ALTERNATIVES?
-Don't drink keep marching on?
-Dehydration is NOT that serious, don't worry about it?
I want to hear from the critics now.
You are in a survival sitaution, you have no way to boil water or treat it.
You are in the recognizeable stages of dehydration, your last pee was dark yellow/orange, you aren't sweating anymore.
Assume that you have found yourself unequipped due to an accident or misfortune, you found some running water, and that you are very lost.
WHAT DO YOU DO??
Tell the viewing audience how they can survive this predicament.