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Your question about water ionisers definitely triggered my bullshit-ometer, and indeed Wikipedia states...
https://en.m.wikipedia.org/wiki/Water_ionizer
Such claims violate basic principles of chemistry and physiology. There is no medical evidence for any health benefits of alkaline water.[3][4] Extensive scientific evidence has completely debunked these claims.
But I'm neither a molecular chemist nor a medical (or any other kind of) doctor, so what do I know. Sounds like a pile of shit to me though!
Tell the fuckers to just drink more tap water rather than expensive slightly different tap water, quantity not (bullshit) quality.