Most people save their grocery shopping for the weekend because it's the only free time they have to accomplish errands. Because everyone has the same agendas, the supermarket easily becomes a frenzy of excuse-mes and darting carts into an empty space at just the right time.
Instead of simply grabbing your go-to brands this weekend to cut down on frustration, consider narrowing the price comparison process to your favorite brand and its store brand equivalent.
When you've discovered the store brand to be lower in price, take it home for a taste test! Better yet, if you haven't completely run out of an item, taste the brands side by side. The worst that can happen is you'll like it less than your preferred brand, but it may be such a subtle difference that you're willing to make a permanent switch.