First thing to do is work out how much weight you can feasibly cut.
2kg can be cut in water easily irrespective of body weight. I'd pick no more than this.
The next thing is finding out how much glycogen you hold. You'll hold 64g for every kilo of LBM.
So if you have 80kg of LBM, you hold 5120g of glycgogen (5kg). I'd err on the low side with this calculation, because completely depleting glycogen is very hard.
You want to be as lean as possible going into the meet, this makes water shed easier and makes for a better cut- an you're more competitive.
7 days out from the meet, cut all carbs. You want to keep calories the same. Keep sodium to a minimum, there is no need to sodium load btw. You'll also want to keep creatine to a minimum
If you haven't realised yet- this means you'll be eating fatty, white cuts of meat like pork, fish, chicken, nuts, seeds and oil.
I'd also start drinking 10L of water a day
Day before the weigh in, cut water out at 5pm
After the weigh in, you'll need to replace the missing glycogen. Divide your glycogen by 4 and that's the number of grams of carbs you need to eat. Go for low GI carbs but obviously this is a lot and you may need to drink much of this. Save the liquid calories for as close to comp as possible when you're not as hungry.
So our 80kg individual will need to eat 1280g of carbs the day of weigh in
Get in the 10L of water as well. It's important to balance drinking and eating so you're not too full to eat.
The morning of the weigh in, weigh yourself. If you're 2kg over or more- forget it. Less than that can be sweated out. So wake up EARLY. Do not do this the night before. You want to lose and gain this weight as fast as possible. I recommend a HOT bath or making a steam room in the bathroom by running the hot tap on full and blocking the door with a towel
Enjoy! This is for 24h weigh ins only.