Being a physician, perhaps my 2 cents may be worth something here. Alkalinization is fad that is being promoted absurdly for reasons that elude me. Money is involved somewhere. So the idea is combating bad and excess acidity.
Acidemia is a state of being and the process causing it is called acidosis. There are few known processes that can cause acidemia to a great degree but these are very few and require hospitalization.
A simple example is diabetic ketoacidosis. A simpler one is starvation ketones.
The processes that cause mild acid buildup such as exercise causing accumulation of lactic acid are rapidly combated and corrected. By the way lactic acid is present normally in the body and acts as an energy shuttle. It is not a bad thing when present in appropriate proportions.
Drinking usual a mounts of highly acidic soda or drinking baking soda or alkaline water can in no way change the pH of the body. People, good people of the world, stop wasting your money. Eat , drink and be merry.