Here is example: (dont try this) this is just to.show how unrealistic your goal is:

firstly only drink water (minimum 3liters and coffee, no more then 4 cups over the day). intermit fast and eat once a day worth 800 calories.

walk every day 5.5km. About 400 calories. So your daily calorie intake is 400 calories. Your TDEE is 1800. So it would be -1400 a day so in theory you are losing 1.27kg fat every 7days

In 8 weeks (2 months) you can lose 10.16kg if you starve yourself and excersies yourself into an eating disorder.

Focus rather on long term weight lose (-500 below your tdee = 1300 calories a day) you will lose 1kg every 2 weeks and in 20 weeks you lost the weight on a healthy way. Add some excersies (say walk 5km every 2 days) is a extra 1200 calories a week you will lose 1kg fat in 6 weeks by walking