At home, the most useful step is to make water access easy and appealing while you sort out the cause. Offer multiple bowls in quiet locations, refresh water daily, and consider a fountain if your cat prefers moving water. If you feed only dry food, adding some wet meals can increase total moisture intake without forcing extra drinking.
Avoid restricting water. If a cat is drinking more because the body is trying to correct dehydration, limiting water can worsen the situation and lead to serious complications. Instead, focus on observation: energy, appetite, gum moisture, and litter box output. If you see lethargy, vomiting, weakness, or sudden behavior change, treat it as urgent rather than “wait and see.”