A little tweak to asim18's ingenious idea if I may.
To keep him alive for the next 18 hours, you could lower down a little thimble of water on a bit of string so the poor thing doesn't dehydrate. You could even make up a little platter of snacks, you know the usual "pidgin" food, seed, worms, bacon sarnie, chip butty with a splash of curry etc. Maybe some light reading material to pass the time, OK Magazine or Zoo depending on the gender.
Or if you can't be ****** to do any of that, would the garden hose reach?