Unfortunately until the parents are willing to let their child grow up it is hard to do it at daycare. Since he is new if the bottles keep him happy then go with that. Over time he will start eating some of what the other kids are having. Try small bits off a spoon each day - a magic bullet will let you puree up lunch or your last night's dinner quickly. The more he takes the more he will take. Alternately start with applesauce or yogurt - will be fine if he is on formula - as it is already ready to eat so not wasteful and just do a dab at a time.

It is also common for a child not to eat for parents and want to cuddle and have a bottle but will give in and eat for you at daycare because the other kids are and because the cuddle to feed bond has not been established so nothing to change. You and the child will form your own relationship around food. We are talking weeks here not days so be patient.