I went onto E-bay and found a nice battery-free small thermometer/humidity gauge. It only cost $4.00 delivered from Hong Kong. Score! With my leftover super glue and velcro from prior internal modifications, I was set. First the water bottles were fully covered by a warm baby blanket.
|A warm baby blanket fully surrounded by a strap for my 40L water supply|
|Step 1 - Velcro on the side of my book shelf|
|Step 2 - opposite velcro on the thermometer|
|Step 3 - Mount the thermometer|