3d printed bottle: glue the top to the bottom of the water station.Carve a little hole in the side of the bottle with a knife. It should be as high as the water station is and a small hole in the closure. the refill the bottle with water and put it on the closure.Now wait and water should start to come out.

Normal bottle: Its the same just with a normal bottle.I would recommend this.

WARNING: make sure that the print went smoothly and there are no plastik remaingings!