I usually just drink a shitload of water all throughout my prep,at a week to a week and a half out,I try to double my water intake,this makes you piss constantly and almost uncontrolably,the night before the contest between 7-9 PM,I stop drinking entirely.
This leaves you pissing like the proverbial racehorse just as you have been doing,but you aren`t replacing the H2O,so you get dryer and dryer but lose sleep in a huge way.
when you flood the system like this and piss,you piss more than you take in so stopping the H2O intake makes you dry as hel the next morning........if all goes right.
I stop sodium at 3 days out,on the day of the show I eat just a bit of carbs at 2-3 hour intervals depending on my condition and just sip on bits of water,I also sip and spit water out at times just to wet my mouth.
No shitloading or tons of carbs for me as I do not tolerate high carbs............a bit more carb sensitive as I got older.