Wow, that sounds terribly disgusting. You had me until you added a minor abrasive and artificial sweeteners (even if stevia is plant derived, it still tastes HORRIBLE).
If you are more comfortable with Alka-Seltzer, which is near the equivalent, try it. However, it also contains aspirin and too much bicarb.
The whole point is to buffer year’s worth of dietary acids to assist the body in reversing the entire process.
Otherwise, the more unbuffered dietary acids, the more the human body dumps (from the teeth, bones, muscle and tissue) alkaline minerals (such as calcium and magnesium) into the blood in order to keep it at optimal range. Body fat also accumulates in order to store all of that acid.
Not only is a potential there for osteoporosis, but developing: diabetes, kidney diseases and more life threatening arterial calcification, heart problems etc.
The liver, kidneys and pancreas can become overwhelmed trying to process and filter excess acids and toxins. All three organs also assist in neutralizing acids: the liver produces bile, the kidneys produce bicarbonate, the pancreas produces enzymes.
BTW, some stevias taste more horrible than others. I like the Now brand.
Additionally, xylitol tastes identical to sugar. Though since xylitol is a sugar alcohol it has a much lower glycemic index compared to sugar. It's also unfermentable and therefore considered 'tooth friendly,' unlike sugar.
Going by the 2 per day limit of Emergen-C that eits posted, I would NOT ingest more than 1000mg of Vitamin C in a day. That's already plenty of ascorbic acid; taking more just makes pH levels overly acidic for little benefit.
It won't cause a dangerously high pH level, but it's not normal to the body.
The pH of Emergen-C is formulated to be near neutral.