Just thinking back to the days when I used to go motor racing in Florida, the Americans use large unpowered cool boxes and bags of ice to keep stuff cool (I suppose due to not being on power for 3+ days). That worked very well, though you'd spend a few quid on bags of ice every few days - but that was in really pretty hot environment. The trick is to not keep them open too long, and where poss only put stuff in which is already cool!
They mostly had big ones, sometimes on wheels, and often had a drain plug as they'd unbag the ice cubes and pour them over everything. This kind of thing tinyurl.com/d5us2vf2 but you can get them much bigger.
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