I have a 7 month old son with SWCAH and I have exclusively breastfed him (no formula), but started giving him some baby food when he turned 6 months old. In the beginning, I would mix his salt with some white grape juice and feed it to him in a bottle nipple three times a day. When he got a little older, he didn’t like the taste so he started refusing the bottle nipple. So what I’ve been having to do recently is mix up the salt with juice, and syringe it into his mouth, near the back, several times a day.
I would also recommed talking to a lactation consultant. They may be able to give you some ideas on making your baby prefer the breast versus bottle again. Hope things work out great for ya :)