I don't have any kiddos in the dayhome on formula but when my son was still on formula and going to a dayhome I prepared a container of formula every morning and brought it to the provider but she kept bottles at her house and dispensed as needed. That was the system myself and the provider worked out and she never mentioned it to me if cleaning the bottles was an issue. I do have one child that drinks milks from a bottle and I asked that the parent supply the bottles. He only uses one a day though so I pop it in the dishwasher like everything else when he's done with it.