Unless you’re a huge person to start or have massive water weight you don’t. A pound of fat is approximately 3,000 calories, so you would need an almost 3K deficit every day to drop that, and since most people eat around that much as their normal intake that’s an extreme amount that could be deemed starvation.

Now if you happen to be huge where the normal body functioning uses well past that then maybe, but if you’re anywhere below 300 lbs that would be a crazy amount for 2 months.

I’ve heard it said that a healthy target is around 1 lb per week. Maybe 2 if you’re very obese, but at that point you really should be doing it under medical guidance.

In any case, the best way I’ve heard (outside of drugs) is to get an app that helps count calories, set a realistic daily caloric target and exercise schedule, and stay on it.