Try to wash the water bowls and bottles frequently to make them look clean and also prevent your food and water containers from becoming breeding grounds for bacteria. You need to offer your Guinea pigs unlimited access to fresh, clean water. So, use warm soapy water to wash your guinea pig's water bowls and bottles daily. You can use a dishwasher for Those that are dishwasher-safe. Also, keep an eye for any wear-and-tear on any bowl or bottle, and replace anyone that isn’t in good condition.