My cat doesn't drink enough water, he's young but too little water leads to kidney problems down the line. We feed him a small can of wet in the morning and some dry to snack on during the day. Sometimes I put a few tablespoon of water in the wet to get some liquids in him. He won't drink from a running sink.
A family member fosters cats for the human society. She had a kitten jump in the toilet and drown last year, devastating for a crazy cat lady. Put the toilet seat down especially when they are kittens.