I don't shop at Walmart, so I'm not sure of the quality of their gallon jugs. I buy Poland Springs from BJs (like Costco). They're slightly more than no-name brand, but since I can't drink the tap water where I live unless it's mixed with Gatorade powder, and I drink a lot of water, it's worth it to me. I usuallu have 2 - 3 cases on hand at a time.