How many fish are we talking, and what kind?
If more than a few fish, I'd go with something more systematic - a large tank with a lid (rubbermaid type) and an airstone running on off your car battery. You'd definitely want to do kordon bags if you don't use an airstone.
Temperature is also a concern this time of year. At least use a cooler and have some long term warming packs and a thermometer or three on hand to keep things how you want them.
If more than a few fish, I'd go with something more systematic - a large tank with a lid (rubbermaid type) and an airstone running on off your car battery. You'd definitely want to do kordon bags if you don't use an airstone.
Temperature is also a concern this time of year. At least use a cooler and have some long term warming packs and a thermometer or three on hand to keep things how you want them.