I use these bowls and have never had a problem. We use them at work for big lizards too, and no prob. I wash my water dishes and fill them everyday though.
0.1 Ambanja Panther, 1.1 Senegal
2.1 Red Eared Sliders, 1.0 Russian, 0.1 RedFoot Tortoise, 1.0 Senegal Parrot
0.1 Giant Frog-Eyed Gecko, 1.0 Bearded Dragon, 0.1 Black Throat Monitor