What Is The Best Formula When My Infant Refuses A Feeding Bottle And Needs Added Flavors Like Banana, Sweet Potato, Or Strawberries?

Hello Doctor, my son is 6.5 months I started similac pro advance stage 2 with the start of his 6 month but he doesn’t have it without any flavour I mean I need to add banana or sweet potato or strawberries for him also he isn’t accepting any feeding bottle please help which formula is best for him