For commodities, i.e., like bottled water, TP etc., you can just try them at random based on price (low to high) until you find one that absolutely works for yo

For commodities, i.e., like bottled water, TP etc., you can just try them at random based on price (low to high) until you find one that absolutely works for you. This decision is rational since it is not a one-time purchase you have little to lose in the grand scheme of things. If you are cost conscious, using a membership like Sams Club or Costco can help you narrow down a lot of the choices. You may still have to make some choices, but the search space is narrowed down quite a bit. You can rationalize your decision because you already paid for the membership and every choice you make to shop at the warehouse helps amortize your membership cost. (This is also true of an Amazon Prime membership). When you have to whittle down choices using Quality and Price are good factors (assuming the products meet your other functional requirements). For one-off purchases, really plan them out, do comparison shopping, add them to your e-commerce shopping cart and leave them for a week or two (you will get reminders from them with enticing offers asking you to come back).... You may find something better just by going through the process and delaying your decision. And once you make a decision, don't keep revisiting it or have buyer's remorse.