If I was lucky enough to have a second home, it would be rural as we live in the city. So before lockdown, I would have done a check on supplies and restocked fully for a number of weeks - it would normally have a fair stock of non-perishables for late arrivals and short notice trips. And also check that I had sorted WiFi so I could wfh and dd could still do school.
Then, when it looked like it was imminent, do a proper shop for more perishable items, bring everything we would need to be self-sufficient, and go. And then self isolate there.
More space in he house, better walks and outdoor space, and we'd have board games etc there anyway so things to do once work was done.
But it would be on the basis Of being self sufficient and not putting pressure on supply chains or health services there. As we had already been following the social distancing at home before going. (As we did before lockdown happened anyway).