How long is my husband responsible for paying 50% of the household expenses during the divorce process in WI, even if he moves?

You need to file a pendente lite motion to ensure that he continues to support you,. I do not know the amount of support, that depends on factors which you have not posted. As long as you wait for him to make the first move, the more danger you are in that he will make sure he has no money to support you,
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(Even if you are not filing a lawsuit this information can be useful).

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(Much of this information is valid for unmarrieds who have children together).
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LEGAL DISCLAIMER
Mr. Sarno is licensed to practice law in NJ and NY. His response here is not legal advice and does not create an attorney/ client relationship. The response is in the form of legal education and is intended to provide general information about the matter in question. Many times the questioner may leave out details which would make the reply unsuitable. Mr. Sarno strongly advises the questioner to confer with an attorney in their own state to acquire more information.

both of you are responsible for 100% of all marital debts before you file for divorce.

Once you file for divorce, you should as for a temporary hearing where the court will set forth each parties obligations.