Agree that washing all clothes etc, leave shoes outside if possible, as soon as your husband returns, would be good.
However, it is possible to stay fairly separate in many homes, Clare Gerada (GP and I think former Chair of the RCGP or similar), wrote that she successfully isolated from her husband when she had Covid19 and he didn’t. Helpful if you have two loos, otherwise lots of cleaning and organising of loo timetable, I would imagine.
Do remember that most people who get Covid19 have some symptoms, and only a small percentage of people go to hospital or worse. An ITU doctor friend said, ‘Don’t be stoic’, ie get medical help, as you need it.
Good luck with the shop, very difficult times for many small businesses. ?