In Carmelita's bin we have:
one bottle where we drilled a hole for the screw and a hole for the spout
one bottle where we drilled a hole for the screw/mounting bar (the bottle itself is therefore inside the bin, but the only hole is behind the bottle bracket so there's no danger of her enlarging the hole.
I also got two of
these when they were on clearance, just in case/to have as options later.