https://www.fda.gov/drugs/emergency-preparedness-drugs/information-regarding-insulin-storage-and-switching-between-products-emergency (The forum posting routines won’t let me create a link upon which to click) is the webpage from FDA the about storage insulin in disasters. Not knowing your brother’s medications, I don’t know if there is similar advice available. Without going into all the details, I haven’t refrigerated my insulin for my 8 previous RAGBRAIs and won’t be doing so for #9 this July.