The bottle lasted longer. We used a sturdy Snapple ice tea bottle. Just remove the label and plastic cap. Don't forget the little plastic ring. We had to remove that after we noticed Luna almost got it off herself. She rolled the bottle, chased it, carried it around, and chewed on it. We had rinsed the bottle with warm water, but maybe she could still taste some residual ice tea because she kept poking her tongue into the opening. To make it more stimulating, we added a few kibble. It took her about five minutes to figure out you have to tip it to get the kibble out.
We tried a water bottle before but it was too soft and crushable. A Calistoga sparkling water bottle had a long neck that was too frustrating. Somehow the Snapple plastic bottle was just right.