No, that is not normal or acceptable behavior. If what you described is true, it's a highly unusual and concerning situation. Filling salad bowls with urine and keeping them in the refrigerator is unhygienic, unsanitary, and poses potential health risks.
If you encountered such a situation at your friend's house, it's essential to approach it with sensitivity and concern. You may want to discuss the matter with your friend in a private and supportive manner. There could be underlying issues or reasons for this behavior that your friend may be going through.
Encourage your friend to seek professional help or talk to someone they trust about what they are experiencing. It's possible that they might be dealing with a mental health issue or another issue that requires assistance and understanding.
In any case, if you feel that your friend's well-being or safety is at risk, don't hesitate to reach out to a trusted adult, family member, or a professional who can offer appropriate guidance and support.