Same here. Parents would provide the formula and homo milk. Parents provide anything that goes into a bottle - juice, homo or even 2% if in a bottle. I started doing this because it prevents the parent from asking me to fill the bottle at going home time lest the child whine on the trip of a few blocks home and it started to annoy me. Rather than have to reiterate no there are no options if it is a bottle and if it is a cup then it stays at my house because I provide it. If they want the child to have something to drink on the way home they keep it in the car.