I don't have a direct answer to your question about water machines. But I have a few answers that may help you find answers about pH balance. If you are willing to spend the time, you will learn a lot from the Ask Moreless ph Balance forum, right here.
For your question about water machines, you may perhaps try to post your question at the Oxygen Therapies Forum
These protocols help in alkalizing and detoxifying via an alkalizing drink and baths.
All these are cheap and based on simple products.
In my opinion, before buying an expensive machine, why won't you try the protocols, they are not costly. The ML alkalizing drink will add a lot of nutrition that an alkaline water will never provide. It is also important to buy “pH paper” to measure saliva and urine pH levels.