How do i get rid of cellulite without losing weight?

I know this sounds random but i struggle to put and keep on weight. im a uk size 4-6 and i have to eat unhealthy alot of time to keep weight on. i eat 3 main meals a day and snacks. i have problem with cellulite and sagging on my bum. i dont want to exercise where i lose calories because ill lose weight. would drinking lots of water and toning with squats etc be enough?