alkalizing water

There is a chiropractor in town who sells alkalizing water by the gallon. When I tell people I am drinking an alkalizing drink they assume it is this water. Why would drinking the water be useless as you suggest in the post? It seems like a scam to me, but I would like to understand on a deeper level. Is it because this does not help your body build up supplies of minerals?

Thanks!
Blessings~
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