I rent an office one day a week and I do have a separate professional liability insurance. How do I get a liability insurance for this location for onlyt one day a week?

hava395. You don't. Do you see people in the office? The landlord should have premises liability.

Agreed, you can buy liability insurance. If the landlord does not have a blanket policy. But it will not be for one day a week. The cost may be lower, because of your limited usage.