What did Yahweh tell Ezekiel to eat and drink while he lay on his side?

Yahweh told Ezekiel to eat barley cakes and to drink water.

Why did Yahweh tell Ezekiel to bake using human excrement within the sight of the house of Israel?

Ezekiel was to bake using human excrement as a sign that the food the people of Israel would eat among the nations would be unclean.