Ah, the endless capacity of apologists to BS themselves by postulating what's not actually in the text. How cute.
Why don't you follow your own advice and look what's actually in the text?
A few examples from http://bible.cc/ezekiel/4-12.htm :
New International Version (©1984)
Eat the food as you would a barley cake; bake it in the sight of the people, using human excrement for fuel."
New Living Translation (©2007)
Prepare and eat this food as you would barley cakes. While all the people are watching, bake it over a fire using dried human dung as fuel and then eat the bread."
English Standard Version (©2001)
And you shall eat it as a barley cake, baking it in their sight on human dung.”
New American Standard Bible (©1995)
"You shall eat it as a barley cake, having baked it in their sight over human dung."
GOD'S WORD® Translation (©1995)
Eat the bread as you would eat barley loaves. Bake the bread in front of people, using human excrement for fuel."
King James Bible
And thou shalt eat it as barley cakes, and thou shalt bake it with dung that cometh out of man, in their sight.