One of our cats had a serious medical issue (we think a tick bit her, but we don’t know for sure), and after she recovered, she attacked her own tail one night. Woke up the next morning to find blood all over the house. Poor kitty ended up having part of her tail docked. :(
Stop and buy supplies of course! Even most grocery stores carry disposable litter pans, or just a plastic bin, along with food. Even a paper bowl will work for water.