Formula recommendation

My EBF baby is at a daycare and they insist he needs more milk. He only nurses 5 times a day (3 with me and 2 there). I give them 2 4oz bottles but they have been using the freezer stash and then I’ve been having to pour it out because my baby won’t drink it 🙄. But I know from time to time he does need more so I want to give them formula so my milk isn’t wasted if he only wants a little. So I need some recommendations for formula that EBF babies will like.