How do i lose atleast 10 kg weight in about 20 to 25 days WITHOUT EXERCISE?

i need help!!! im gaining weight fast but now i want to stop it and lose some weight atleast. im 20 female and have a height of abt 5.8 or 5.9 ft and weight over 60 kgs....i look older than my older sister becoz of my weight:( plz help me, i cant exercise coz i cant take out time and dont have gym kind of facilities available as well....but i can cut down my diet...just need the right directions...plz help if u can...ill really appreciate it. thank u:)