He asked me out next week to explain and demo about Kangen Water.

When I asked how much is the Kangen Water purifier, he didn't answer but he is using it and will explain the benefit of drinking Kangen Water e.g can heal illness and highly recommended by doctor (typical sales pitch)

Out of curiosity, I google it and found out Kangen Water is also MLM type

https://www.lazymanandmoney.com/kangen-water-scam/

Haiz why so many youngsters and elders like to work in MLM?

Kangen water is "turning" your normal PH 7 water to PH 9+ (i.e: alkaline level). Since your stomach is mostly acidic (< PH 7), it is supposed to "neutralized" the acids and make you feel better.

This is like placebo. It doesnt have any real benefits.