Aqua Galac
ガルクスアクア [garukusu aqua] in Japanese. It's unclear what 'garukusu' refers to, possible spellings include 'galkusu, 'garkus', 'galukus', even 'galacs'.
Grimoire of the Rift

Buy: - (sell: 1,200 gil)
Use: Joyeuse, Mage Masher, Zanmato
Reward: It's a Secret to Everybody (once), Grounded! x2 (once)
Type: Philtre, Rank: ★★
Description: This water is rich in minerals. Can cause indigestion in those not accustomed to drinking it.
Final Fantasy Tactics S

Buy: - (sell: 200 gil)
Use: Gun
Obtain: Cend Region/Mejer Coast lv30+
Description: An uncommon substance
Category: Item