I've heard really mixed reviews from various people who've tried both alkaline water and ionizers. Cost seems to be a major problem, and benefits, if there are any, may be invisible and cumulative. I'm skeptical.
But I'm interested, because I actually use an alkalinizing powder that contains nothing more than potassium carbonate and calcium carbonate (one of those is a bi-carbonate, forget which), plus baking soda. Since one of those ingredients is by prescription only, I have to buy this from a compounding pharmacy, but it's WAY cheaper and longer-lasting than the alternatives ($30 worth lasts me several years). I could probably find out the proportions if any moms are interested.
I am definitely more comfortable after I use this powder, but that may be because I've developed crazy sensitivities to the chemicals everywhere in modern life. I often feel like I'm uncomfortably filled with jabbing elbows, very distressing, when I become sensitized, which also results in higher body acidity. Often, exactly 16 minutes after I take half a teaspoon of my "tri-salts," I'll suddenly feel better, dramatically.
I also tend to have trouble breathing when I'm acidic, and it can give me sleep (and even waking) apnea. The alkalinizing salts fix it. Good stuff, if what you're suffering from is excess acidity. If not, I'm not certain it would do most people much good.