Mixing of urine and water

Assalam o alaikum. I went to washroom to take bath. During changing clothes, my bladder felt pressure and small amount of urine came out. Then I emptied my whole bladder. Unfortunately, the urine did not pass down the drain as it was choked. Furthermore, more water came from another washroom and the water was standing in the washroom with the urine mixed. What should I do now? My slippers also came in contact with them and I travelled to my room in them. Furthermore, students bathe here and then go to Masjid. I'm very worried. What shoul I do?