Effervescent Water is an FFXIV crafting material gathered by the Miner class, a Disciple of the Land. Naturally sparkling water bottled at the source. It’s a common ingredient in a few Weaver and Alchemist recipes.
You can find the material within Level 25 Mineral Deposits in the Upper Paths (X: 16.1, Y: 19.1) in South Shroud. Before you can acquire the resource from the node, you must first unlock the Miner class. Then you need to be at least Level 21 before you can tap these nodes and acquire this material.
Inside the node, you’ll also find several other materials, including: