I have 5 17 week olds and I would like to make a dust bath for them but I am concerned about the amount of DE to use in it. Everywhere that I have read they say "sprinkle" the DE but I would like to know exactly how much to use so I don't put too much and hurt my girls. Can someone define a "sprinkle"; ie: teaspoon, tablespoon, 1/3 cup? I will be making the dust bath in a normal size cat littler box. Any help will be appreciated! Thanks!