If you had to live with only one piece of technology in your home, what would it be?
Just to make things a bit easier and permit discussion here, you are already granted certain home basics, including electricity, running water, a toilet, internet connection etc..
The definition of "technology" as applied in everyday life can be ambiguous, so for the sake of some orientation in this discussion, here's an extracted definition of the word "technology" as written in the Oxford English Dictionary, which you can use as an anchor if you so wish.
technology n. (pl. technologies)
1. The application of scientific knowledge for practical purposes.
2. Machinery developed from this.
As you can see, the above definition collectively qualifies almost every man-made item as technology; this goes also for items that don't necessarily fall under the sub-definition "2.", but are nonetheless products of technology, and therefore fall under the sub-definition "1.". In this sense, items that don't necessarily require electricity to function can also be considered as technology, including clothes, tools, instruments, and so on.
As for me, if I had to live with one piece of technology in my home it'd be without a doubt, the microwave! It's cheap, fast, and reliable. For about 4 years it was the main piece of technology I relied on for living when I first moved into my own apartment - not just because it merely meant cooked food, but because it gave me more affordable options in buying food. And guess what? After about a decade, I still have that microwave!