Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4939846.

The cage for my daughters rat has narrow horizontal wire bars. It came with a big spring to hold the water bottle against the bars but she can't work it with the tension on the spring enough to hold the bottle in place so I designed a bottle holder that clips on the cage. The file I shared is for a bottle that is 131mm tall, has a 51mm diameter, Cap with a 51mm diameter going on a cage with a vertical wire spacing of 10mm and a horizontal spacing of 122mm. The FreeCad file is also shared and Parametric so you can customize the size. I'm no good with Scad so can't make a "thingiverse customizable" part.