PET bottle water bowl
Water dispenser for pets, using a PET bottle as reservoir.
Stable with a small (12 fl. oz. / 50 cl) bottle, but if using a larger one (like the 1.5 liter bottle in the picture), tethering to something like the leg of a table is highly recommended.
Use common sense when selecting plastic if you intend on feeding your pets from this. I printed with inert Taulman Nylon with great success, which also makes the bowl more or less indestructible.