This is common supply sold by many self reliance websites for around $12/bottle to preserve water up to five years:
The ingredients are listed as 5.25% sodium hypochlorite. So, exactly liquid laundry bleach. My local supermarket sells that for the equivalent of 8¢/oz or 1/205th the cost. And its likely to already be on the shelf in your house.
Are these people defrauding us? Not really, it does what it says it does. Could they be doing better if their goal was not merely to make money? Certainly.
As a refresher here is the table for using bleach to sanitize and preserve water. It is copied from a handout I created a few years ago. You should print it out for your records.
