My ferrets drink a cup of water with several drops of lemon juice in it and no sugar is in it. Is it safe and healthy for them and is it a normal behavior?

While a small amount of lemon juice is generally safe for ferrets, it's not necessary for their hydration and could potentially cause stomach upset in some individuals. Ferrets typically prefer plain water, and introducing citrus can lead to digestive issues. It's best to provide them with fresh, clean water without additives to ensure their health. Always monitor your ferrets for any adverse reactions when introducing new substances to their diet.