Not wanting formula

Hello ladies, I was just wondering if anyone else is having a problem with getting their LO’s to drink formula?

I have twin boys and I’m struggling to get them to drink 12 oz each (that’s on a good day) of formula in a day. They prefer to eat food (baby food mostly but we let them try what we’re eating too) and drink water out of their sippy cups. I’ve tried putting their formula in the sippy cup thinking that would help them want to drink it, but that didn’t work. I’ve been giving them a bottle before bed which I don’t like doing because I feel like it’s habit forming and bad for their teeth, but it’s the only time I can get them to drink 4oz in one sitting.

Any advice on what to try/do next?