We did not choose to seek shelter. I kept a blanket over the companionway hatch and pulled out the propane heater to supplement the electric heater we use.
We used both heaters during the day and only the electric one at night. I'm pretty sure we maintained about 50 degrees in the boat overnight and prob 60 during the day.
We ate our normal meals. I think we had tacos on the night it was so cold.
Sleeping in an ice covered bed sucked pretty bad. Here are two photos of what it looked like in the V-Berth where we sleep.
Yes, that is ice build up inside the boat.