Does she like frugal shopping? Encourage her to buy extra food when it's on sale. To save money over the course of the year

Water in bottles in the back unused space makes the fridge and freezer run more efficiently. And keep cold wthout power. Distilled water for the car batteries and the iron.

A hot tub would be a source of un treated water and an excuse for pool shock. A pond? A second water heater inline adds efficiency to the system 50 gallons extra...

Have a box of "camping food". The headlamps you need for working on the car or in the crawl space... speaking of crawl space its likely got lots of room.

Like Irving said with lamps. Also tiki torches for parties and citronellla. Propane for the bbq a couple of extra tanks cause you hate running out when the steaks are on. An extra tank for the mower. Same reasons. Seperate tank for the weed eater.