clauses - of which each VS. each of which

If Country exists, if Country is a natural necessity like bread, of which each of us must eat in order not to die of hunger, somebody must go to defend it.

Would you please show me if the bold parts mean the same thing?

each of us of which

What is more, could you teach me other possible ways to write the following part?

of which each of which

Thanks in advance

Updated:

In order to avoid ambiguity as to why I have raised the question, the following might be useful:

The bungalow, of which the roofs was damaged, had to be corrected.

The bungalow, the roofs of which was damaged, had to be corrected.

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