If you have a piece of fish, you could try boiling it and giving him the juice. Fluids are more important that food right now. I would even go as far as trying to bottle feed/syringe him some tepid water if he won't lap it. If you can't get a kitten bottle, I know tesco have some toddler cups with a rubber spout*, although not sure if the spout is small enough for a cat.
*In case you are wondering how I know - I nearly got one as a joke for OH today who keeps knocking glasses and cups over