@moonrabbit my actual lonely cat was used to follow the "thirsty leader" cat (he enjoyed drinking water a LOT because of his disease but not only) So she is not enjoying drinking that much but : She is enjoying the plastic empty box full of water Sometime I put 2-3 ice cube, it make her curious, the little thing that float gently
Maybe it is something you can try ? Maybe not a full very big box like us (about 5-7 litres ?) But a box not half-full ? (Take care of your back, don't hurt you, it can be heavy, even 2 litre/2 kilos of water)