Go keto. From experience, if you are honest, keto reduces the feeling of hunger and you do not feel an urge to eat this much. But it still is not a free fix and you need to hold back.

First count how much is your daily use and do not go beyond that eating fats and proteins. You will feel quite bad for some two days once your metabolism changes to this new kind of food. You will feel an instant 1-2kg weight loss because excess water has no sugars to bind to after your natural stores burn up. If you quit keto you will gain 1-2kgs of water back fast.

After that mode switch it will only be easier. Try to eat less over a few days until you live off of 1000-1500kcal a day. A kilo of human fat tissue has about 7800 kcal for reference so you can make expectations on how fast you should go down.

For drinking use anything that has no sugars - so non sugary soda. Milk also has lactose and it is a sugar. Remember to not forget vitamins. If you are a retard like me milk is an answer for all vitamins. It is technically possible for humans to live only off of milk and no other sources of food or water, no other nutrition source can do it. If you feel like you are dying drink some milk.

You just sit and if you are honest it works. You will feel strong urges sometimes but try to get used to that suffering and prolong it as much as possible. Eat whatever to fill your stomach for the pain to go away but just enough to have bare minimum power to walk and not feel the agony, nothing beyond that.

At best I lowered mine to ~650 kcal a day in one meal a few hours before sleep but after under two weeks I had to stop because I fell from stairs of lecture hall and I needed to call it off
I lost 7 kgs in around 12 days with one being a cheat day, and regained under 2kgs of water back but still 5kgs permanently in 12 days is a good score considering that I was active most of the day.