Yes, rabbits absolutely need water bottles. They can get dehydrated from being out of their cages for too long and have a tendency to move droppings from one area to another in an attempt to keep cool on a hot day. Rabbits generally want a source of running water that's accessible at all times, but they also need fresh food and clean bedding. Be sure you're keeping up with all the essentials! It is not usually necessary for smaller pet indoors rabbits to have water bottles because if they maintain a healthy diet and get enough room time outside their cage on a daily basis, they won’t feel the threat of becoming dehydrated or overheating as easily as outdoor rabbits do.