
Copy the useful parts
Your glass may be freshly filled, higher up, away from food, or in a social spot. Try a clean bowl in a similar location.
Updated
Water preference
A human glass may win because the water is fresh, high, narrow, away from litter, or simply more interesting.
Use the preference as a clue. Build a safer water station that copies what your cat likes without sharing your glass or ignoring health changes.

Your glass may be freshly filled, higher up, away from food, or in a social spot. Try a clean bowl in a similar location.

Shared glasses can carry residues, spills, and hygiene problems. Offer a cat-safe station instead of turning it into a daily habit.

If the glass is preferred because it is fresh, add a morning and evening refill routine or try a fountain you can clean well.

A new obsession with glasses, more drinking, more urine, weight loss, vomiting, or appetite changes deserves a veterinary call.
Use gear that copies freshness and placement without sharing human drinkware.
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It may be fresher, higher, away from litter, in a social spot, or more interesting than the regular bowl.
It is better to provide a cat-safe water station. Avoid shared glasses because of spills, residues, and hygiene issues.