You can make a drinking bowl from various materials like plastic bottles, plastic containers, cement, soil, metal and more. However, the procedure depends upon the type of pet bowl you want to make. If you are making a simple traditional dish, you just need to mould the material. However, make sure it has smooth edges that do not hurt the pet. If you want to make something like a self-watering dish, or fountain water bowl, you need to apply a technical approach. For that, you might also need some DIY tools like a drilling machine, motor, screws etc.