8oz Lixit Glass Water Bottle www.petsmart.com - $7.99 (in bird section) Product Description: Lixit water bottle for birds and small animals. Dishwasher-safe, thick glass has a vacuum seal and stainless steel tube with double ball point tip. 8 fl. oz. option connects to outside of cage with chain and "quick connect" springs. RattyRat's Review: You always want to use a water bottle as opposed to a water dish. Why? Because a water dish will rapidly become filthy, and some can be easily tipped over, leaving your rats with nothing to drink. A water bottle keeps your rats' water clean and contained. When choosing your rats' water bottle, you want to stay away from bottles that leek, bottles that are not transparent (leaving you unable to see how much water your rats have left), and bottles that are difficult to attach. Lixit makes a plastic water bottle that works very well. So why do we recommend the glass version? Because rats can't chew through it. It's also easier to clean being dishwasher safe, and some have claimed that plastic water bottles can seep toxic residue into the water over time.