Best everyday tool that you realise is a something everybody should own

Glass jars. They're space efficient, you can see what's in them, they're easy to label, they're easy to acquire, they can hold just about anything, they're durable, they're resealable, you can use them to preserve things, and you can use them as drinking glasses.

Instant pot

Self jumper cables so you don't have to rely on another car, WD-40 to make stuff not squeaky, white noise machine to drown out noise, a wrench with a 90 degree angle to make certain screwing in easier

a high wattage GaN usb powerbrick. my 100W one is probably my favorite purchase ever

A sturdy shoehorn. Cumulatively saves significant time tying/untying laces on way in/out of house.

Robot vacuum

Stretching your definition a bit, but if one reads "everyday tool" as "something you use nearly every day" and "tool" as "piece of technology that makes accomplishing a specific task easier" and "own" as "have access to be able to use" then I'm going to say GitHub Copilot. I seriously cannot overstate how much of a life changer it has been for me since I got access to the closed beta. If you are someone who writes a lot of code, I urge you to give Copilot a try. It is so astronomically different from even the best traditional autocomplete tools.

electric kettles are goated

a safety razor (like a Merkur Mk34c), you will save so much money (good blades are less than $1 each, search feather) and it gives a much better shave. Add a silvertip badger brush and a nice soap (Trumper Eucris) and you'll love every morning