Meltwater is water released by any form of melting, snow or ice, including glacial ice and icebergs. It can also be also a result of technically frozen and melted Ice. A Glacier is a persistent body of dense ice. The difference between an Iceberg and Glacier is that the iceberg is the piece of a glacier that breaks off. Iceberg and glacier water is the most technically challenging and physically hazardous bottled water to produce.