First thing is to weigh yourself in the morning post toilet to get a base line. Then monitor your evening weight pre sleep to see what you weigh and see how much weight you drop over night.
You have 16 days which is plenty to drop 2kg.
I usually just cut in the sauna but this may hurt you badly depending how you respond to being dehydrated and if you will be the 2nd or 3rd group lifting instead of the first group. Chew gum to keep your mouth from drying up.
You can do water manipulation.
7 days out pound 4litres a day for 5/6 days. The last day drink only half a litre and you will drop a good 1.5-2kg depending on how you respond to it.
Avoid salt a week out from the comp is another tip.
I personally just abuse myself in the sauna. I usually lift in the last group so I have more time to recover.