I need clarification on your question. You asked about "hypo" acidity, and later talked about "Hypochloridia." Both of those are indicative of low levels of stomach acid.
The responses seemed to address "hyper" acidity, which is too much stomach acid and the direct opposite of hypo. You should first be clear what it is you are dealing with so you don't agrevate any condition you have. Do you have too much acid or not enough?
My wife has too much acid, she takes Prilosec to control it, as prescribed by her regular doctor. She has recently begun seeing my natural practitioner, and was able to bring her overall body ph down, with the hopes of eventually controlling her stomach acid through diet or other natural means. Prilosec is currently considered very safe with minimal side effects and seems to do a good job of limiting excess acid.
I have Hypochloridia. I don't produce enough stomach acid (which is hydrochloric acid) which impairs my digestion. Since adding hydrocloric acid capsuls to my diet, a number of improvements have resulted.
There are over-the-counter hydrochloric acid pills (Google Betaine). You find out how many capsules or tablets you need by taking one shortly before you eat a meal. The next meal you increase to 2, then 3, and so on until you experience a heartburn sensation in your stomach and chest area. Then back off one to two tablets, and that would be your "dose." This may change over time, and should never exceed 10 tablet per meal. Once you establish your dose you can take them with your food.
This should be sufficient if all you are experiencing is simply from low stomach acid levels. More likely than not there are probably other issues, but this could be one move toward better digestion.
Hypochloridia can be a genetic trait, but can also be caused by other factors such as diet, or simple aging. It is fairly common in older individuals.
I hope this helps to clarify the difference between hypo and hyper acidity. You probably see the problems one could magnify if not knowing the difference, i.e. taking antacids when you already have little stomach acid actually increases indigestion, rather than relieves it (I made this mistake for years).
Happy to share more, just ask. Good luck!