Tbeans

Hi all, I am taking over a ceramics teaching position at a high school. I have a Soldner mixer that's got plenty of clay in it submerged in water, I'm wondering what I can mix with it to reprocess that clay and get it to the correct consistency. I'm 90% sure the clay was a stoneware from Blick Art Materials. I'm guessing ball clay, but after that I don't know what else, or if there are premade mixtures to buy? Thanks in advance.