From: "Fluid Mechanics" by Streeter & Wylie (C)1979
density of water is 1.94 slugs/ cubic ft
32.174 lbs/ slug
And there are 16 oz in a pound
So...
1.94 slugs/cubic ft * 32.174 lbs/slug * 16 oz/lb = 998.681 oz/cubic ft
keep in mind that this is probably at standard pressure and temperature.
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