Heartburn from thai bottled water

 
I'll only comment on the one site.
 
This is clearly not produced by anyone with scientific knowledge, and I'm pretty sure the figure is just plucked from the air.
 
When a site claims "bottled waters that contribute to excess body acidity" one instantly knows one is dealing with a charlatan or ignoramus.  The body's pH is managed by homeostatic processes within an incredibly narrow range, 7.35-7.45.  Outside that range, and you're going to be severely unwell or dead.
 
https://www.forbes.com/sites/quora/2016/03/11/how-our-bodies-go-to-extraordinary-lengths-to-maintain-safe-ph-levels/#62cfa2d870e5
 
The home page of the website further proves it to be run by quacks and snakeoil salesmen.
 
"Detoxify" - nobody can actually say what these so-called "toxins" are.  They are not something scientifically recognised.  They're just all woo.
"Antioxidants" - the body is already packed with natural antioxidants.  Consuming food with antioxidant properties has no detectable effect on the lefts of antioxidants in the body.  It's also questionable whether oxygen and hydrogen even act as antioxidants in the body as is claimed.
"Water ionizers create high alkaline and low pH water" - utterly impossible for water to be both highly alkaline (high pH) and low pH at the same time.