i'd say drop sodium to nothing, calories low...carbs next to nothing, water high. water is all you can lose at this point. its quite unlikely that upping carbs will do anything good, even if he's low carb since he is likely not contest ready. with a day to go stop drinking for 24 hours...you'll likely feel like crap, but you can lose a lot of water in a short time and look alot more ripped than you actually are.