I'm going camping this weekend & need to take a large dessert (to feed at least 12) that can be made today & survive from Friday am in either no fridge at all or a basic cool box until Saturday pm. I was thinking some sort of cake but have only ever made Victoria sponge
Make a mug of strong coffee, let it cool, add a slosh of brandy and dip chocolate chip cookies into it then pile them up in a bowl. Each cookie needs to be in the coffee for about 2 seconds. Cover and leave overnight. Tastes amazing and I've never felt the need to refrigerate it as it's just cookies coffee and brandy. It does have to be made the night before though to give it time to soak properly. It has the be the easiest and most popular dessert I've ever made. I'm always getting requests to bring it to parties and family gatherings.
Make two chocolate biscuit "salami" (crushed rich tea biscuits in thick melted butter/sugar/cocoa/sometimes egg/occasionally brandy sauce, rolled in clingfilm, dusted with icing sugar and sliced to look like salame). Make a simple one for the kids and add nuts or glace fruit for the adults. If you put them in the freezer until you leave, and then the coolbox, they'll survive. If you can control yourself until then!