We found one dictionary that defines the word cat's water:

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1. cat's water: Wiktionary

Definitions from Wiktionary (cat's water) ▸ noun:  (slang, obsolete) Gin. ▸ Words similar to cat's water ▸ Usage examples for cat's water ▸ Idioms related to cat's water ▸ Wikipedia articles (New!) ▸ Words that often appear near cat's water ▸ Rhymes of cat's water ▸ Invented words related to cat's water