Below, you can find the full FFXIV: A Realm Reborn item info for the Silverwater item. This item is a Quest Items and is usually a crafting material or the product of a craft. Sometimes it can be dropped from a monster or found in a chest.

Silverwater - Quest Items - Items

Silverwater
Quest Items

Suits: All Classes

Level: 0 		Item Level: 1

NPC: FFXIV Gil 0

A bottle of silver-hued water which resembles mercury in nearly every respect.