Attach water bottle to RUB cage

I am beyond frustrated. I made four Really Useful Box cages before RF and cannot for the life of me figure out how to get a water bottle to stay attached to it.

For those of you using bin cages, what method did you use to attach a water bottle?

I drill a hole for the water bottle spout and above it two smaller holes that I put the wires from that likke U-shaped wire thing that comes with water bottles through to hold it up.

Ditto!

You can also put bottles on top of the bins, sticking the nozzle down through the mesh.