This is so cool — it's a water bottle with a small bowl attached. You allow the water to flow into the bowl, and then when they're done drinking, the water goes back into the bottle. Great for walks and for taking with you in the car. (And if you have a snobby animal who prefers drinking from a flowing stream of water, you have that going for you as well.)
(I’ve seen other models since learning about this technology, but this is the one my dad has)