Two weird questions. What’s your fridge set at and how far away do you buy your milk?
It’s pretty common in grocery stores and during shipping for milk containers to break, jugs or bags. I’m wondering if perhaps your fridge is set too high and your store is close enough that when you put the milk in your fridge it would be the coldest object, causing condensation which makes a puddle of ‘milk’ that is washed off the outside of the jug.
Maybe? It’s weird that it doesn’t ‘leak’ after you open it.
Take a look at cement board and the codes for your area for a wood stove.
There’s certain gap requirements for heat etc but you could rig up something fairly simply whether a box or more open enclosure.
There are also fire extinguishers that are activated by heat and sit above a potential fire source. People use them in 3D printer enclosures fairly often. Batteries burn for a long long time depending on how charged they are so it would have limited effectiveness.
This could actually be a really interesting and useful product idea. Maybe a kit with GFCI outlet, surge protector bar with fused outlets, huge spacing between outlets to allow for large plugs, metal/cement board case, wire shelving, ventilation fans to keep batteries cool but have louvre shut to cut oxygen for fires. Hmmm I want this for my garage.