New but Old Member

I joined this group several years ago but have been away from the site for a few years so had to join again. I have been using MMS for about 6 years and have been making my own MMS but have been buying 4% hydrocloric acid since it replaced citric acid as the preferred choice. I want to make my own hydrocloric acid in case the time comes when we can no longer buy this on line. I understand that it is made from muriatic acid but I'm not sure what to look for when choosing this product from my hardware store. Is there any difference between the types of muiatic acid? Thanks in advance for your help.

The easiest way is to watch this video.