Because you have chronic kidney disease with a GFR of 31 mL/min, loose motions should be taken seriously, as diarrhoea can quickly lead to dehydration and worsen kidney function. Drink small, frequent sips of clean water or an oral rehydration solution unless your doctor has advised you to restrict fluids. Eat light foods such as plain rice, bananas, toast, or applesauce, and avoid oily, spicy, or dairy foods until your symptoms improve. Do not take antibiotics, anti-diarrhoeal medicines, or painkillers without consulting your doctor, as some medicines may not be safe in chronic kidney disease. If your diarrhoea is severe, lasts longer than 24 to 48 hours, or you develop fever, blood in the stool, severe vomiting, dizziness, reduced urine output, or worsening weakness, seek medical care immediately. Your doctor can determine the cause and prescribe treatment that is safe for your kidney function.