I've never seen anyone toting big heavy and fragile glass carboy to Whole Foods, they're always hauling a lightweight plastic jug into a store that filtered the water with plastic PET tubing, plastic polyamide reverse osmosis filters, and plastic dispenser hardware, and likely taking it home to a water dispenser also predominately made of plastic. Bulk jug refills are cheaper and less wasteful than 12oz bottles but as a mechanism to reduce exposure to plastic contaminants I'm not going to assume it's meaningfully better.