Baby doesn’t want to drink his milk

I need help. My son drinks formula that I happen to get from when I cross the border because it’s literally the only formula that has helped him not spit up or throw up since he was smaller. He’s 9 months and i ran out of his formula which I will be receiving more until tomorrow. I am currently trying to give him enfamil gentle lease and he does not want it. All day he has been eating soup with veggies, water and fruit. He’s been fussy all day because of this. I don’t know what to do.