I put 5 or 6 gallon jugs throughout each of my Park Models on all my rentals in Yuma. Worked for me for the last 14 years. Make sure and take the lids off. LOL
One of my renters left a 12 pack of pepsi in the ref and somehow I missed it. They exploded. Heck of a mess. Not the best idea to leave can goods although my DW leaves them sometimes in our Yuma House with no problems. It is well insulated. I put about 15 gallon jugs in my 3 br Home in Yuma during the summer.
I always have a half jug of water in each container when we get back in Oct