For those of you that have to supplement what formula are you using?

I have to go back to work in two weeks and I just don’t get enough while pumping to give daycare enough breast milk for the time I’ll be away. I still plan to breast feed him when ever I am home and or were together so I don’t know if there is a better formula for babies that are getting both? I also don’t want him to want the formula more if that makes sense. I don’t want it to be so filling that then he can’t get enough from me.