I was raised to use wonder read for plumbing. It is an ideal temporary plug. You pack it into the pipe and it will stop the water for 5-10 minutes while you fix the problem, then, you turn the water back on and it dissolves in water and never causes a clog.
Note: the video talks about cold rolling grain but these days hammer mills are used to pasteurize while milling. I know people who swear by cold rolling cereal grains because of the effect of high heat on the oils.
