John Scalzi is shocked! shocked! to learn that his cat drinks from the toilet. Well, not all cats do this, but this right now may be the only time in my life when I haven't lived with a cat who drinks from the toilet. It's not universal, but it's not uncommon, either. Cats like cold water, which is what attracts them to toilet water: it's always cold, by virtue of being insulated by as much as two inches of porcelain. If you think your cats aren't quite drinking enough water, especially in summer months, try putting ice in their water dish when you fill it. This has often worked for our cats.