How long will refrigerator stay cold when in travel?

WVbassmistress wrote:
Something my husband and I have gotten into a habit of is freezing the bottled water we are going to take anyway.

Yes. This.

If the OP doesn't want to run the reefer while traveling, treat it like a cooler. Water frozen in plastic bottles (squeeze them a little before freezing so they can expand) is like ice in a cooler, but no need to deal with water from melted ice.