Water is limited by the number of bottles you have. Bottles need to be physically replaced (and can be heavy). Dispenser requires routine inspection and maintenance.
A water dispenser is a device that channels water from a 5-gallon plastic jug into a spout from which you can then access the water; alternatively, a water cooler enables equitable access to water while offering numerous other advantages.
For the most part, both water dispensers and water purifiers provide the same safe drinking water. With that said, the former has an inherent risk of microplastic contaminants, given the use of plastic bottle containers.