I mean you can use ice packs in an insulated cooler with a thermometer and store it at 36-46 degrees, or 2-8 degrees Celsius.
More of a short term solution though, that would get old fast if you’re having to constantly change ice packs and monitor temperature. You have to keep them cold after reconning them or they’ll degrade pretty fast
Guessing you’re trying to hide it from a parent or something?