I keep my dog hydrated with this bottle carrier that doubles as a bowl.
I designed it specifically to work with 16.9oz Poland Spring bottles - one of the more ubiquitous water bottles around in my neck of the woods.
The paw prints keep it from rolling around when set down, but I usually hold it in my hand while using it. I included a version without the paw prints as well as a little matching cap so that people know it's the dog's bottle.
You can run a string (I used a shoelace) through the two holes as a shoulder strap which also helps keep the bottle in tightly.
The build took 2:40 on a Replicator2 with supports and .30mm layers.
Since the build uses supports, the bottom side could do with a bit of sanding.