Peer reviewed publications offers the only venue for accountable reporting on complex subjects.
By definition this mean "accountability to peers" and is the only mechanism which outsiders can use to gauge the credibility of claims.
Like all things humans do that is not pure maths, it's not perfect but the best we have.
/r/AskHistorians may be a fine place to discuss history but without sources the comments can be treated as nothing more than opinion.
That Reddit comment is literally saying "[the claim that beer was safer than water] cannot be substantiated with primary sources". You're complaining that somebody isn't citing sources when all they are saying is that there is a lack of evidence that the claim is true. You're placing the burden of proof in the wrong place.
Sure, the Reddit comment says there is no primary source evidence to back up the claim that beer was used as a safe alternative to water but that does not make it a source to claim that beer was not used as a safe alternative to water.
Furthermore, the Reddit post makes unsubstantiated claims, such as "failing many logic tests" without naming the logic tests themselves. The entire second paragraph is predicated on the assumption that homesteads used only clean water sources without polluting them. How did they handle waste? Did they know how far from water sources to deposit their waste? The comment doesn't say.
Indeed the burden of proof is on the accuser and in this case the GP is the accuser. Reddit comments do not meet my standard for proof.
I would apply the same rigor to a claim that beer was used as an alternate drinking supply.
Internet comments are just that, commentary. The same as the opinion piece in a newspaper. If they are to be used as fact they must meet a much higher standard or be disregarded. It is not acceptable to cite one opinion as proof of another.
Unsafe water in large overcrowded cities such 19th century London is proven but an exception not the general situation for the whole world over time.
What part of drinking water makes it self-evident that it was drank before beer? Additionally, how does it establish a long history? You seem to cite your entire comment as a source for the extraordinary claim that drinking water has no substitute and that adding things to water only makes it worse.
Are you saying that any additive to drinking water is harmful?
You're taking skepticism to absurd levels. Water is naturally occurring. Beer is not.
Besides, most of the comments in this thread are positing wild guesses and making spurious claims. If you didn't complain about the article or those comments you have no right to complain about my link not being a high standard of truth :^)
The quality of comments in this thread are entirely irrelevant to the comment you linked. I apply the same standard to all internet comments.
If you wish to deflect that is on you but I stand by my standard of truth.
http://www.who.int/water_sanitation_health/diseases-risks/en...
Of course there are stories of soldiers augmenting pond water with wine, but this could have been as much to make it more palatable as preventing oneself from getting sick.
Here's a paper that talks about Ancient thoughts on water: https://issuu.com/eajournal/docs/articulo_-_van_tillburg_-_d... Basically, humans have for a really freaking long time been able to determine whether water is basically more or less safe to drink, and have not really worried about it more than any other thing (and certainly not drank beer or wine because they feared for the quality of the water)