Hello! We are doing a day trip to Montserrat during our trip to Barcelona. As per Rick's suggestion in the guide book, we plan to purchase meats/cheeses/etc. at the market in Barcelona before heading there in the AM so we can have a picnic lunch on the mountain. Does anyone have any tips on how to keep the meats and cheeses at a safe, cold temperature for the several hours between purchasing and eating? We could carry a collapsible, insulated bag, but what should we use for the cold pack?
On a trip last year, we stayed in an AirBnB and were able to freeze some plastic bottles of water in the freezer overnight -- they worked as our ice to keep lunch items cold as well as our drinking water for the day. We won't have a fridge (mini or otherwise) this time, so any and all advice is much appreciated!