Green’s Dictionary of Slang

aqua n.

water.

1843		R.S. Surtees Handley Cross (1854) 117: Pumpaginous aqua (which he says is french for tea and coffee).
1859		Matsell Vocabulum.
1899–1900		C.L. Cullen Tales of the Ex-Tanks 69: I had [...] a straight aqua record of four months behind me.
1966		P. Boyle At Night All Cats Are Grey 215: A large tumbler, as usual? And up to the top with aqua!
2016		N. Cummins Adventures of the Honey Badger [ebook] They slammed into the deep aqua below.
2019		P. Baker Fabulosa 288/2: aqua, acqua water.
2023		R. Milward Man-Eating Typewriter 37: There was running aqua in the water-pump.