I doubt your fluid intake is affecting your morphine.
Here is an article about absorption and excretion of morphine and its metabolites:
Morphine
Drinking to much fluids can deplete sodium however, and lead to hyponatremia.
Hyponatremia Causes - Mayo Clinic
Some common drugs can cause hyponatremia:
Management of Hyponatremia - American Family Physician
opiates (like morphine) appears on this list:
A Review of Drug-Induced Hyponatremia (PDF Download Available)
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Weezie looking at petunias 8.25.2017
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