In the mean-time I've taken all my liquid out of the refrigerator and it's now in a box in a dark corner in the coolest (which isn't very cool) room in the house.
I'd also put it on the floor of that room. Heat rises and all - might cut a few degrees off if stored on the floor. Just my obvious and tiny contribution to the thread (my place is usually over 80°F in the summer as well - and I have no basement).