How far into the future we talking about? If it's 100+ years, I'd buy something I know would become valuable and keep that, I'll be rich in a blank of a flash!
Or still poor depending how much shittier the economy gets lol.
Lets just say it is an undetermined amount of time, could be weeks, could be hundreds of years, but everything else you own will be passed to your heir(s) and is assumed to be gone. To make things interesting, lets assume the time capsule has a maximum size of 3' x 3'.
Personally, I would put a variety of Cannabis seed, clearly labeled so as to be able to tell what variety you will be growing. I would also put gold and silver coins in the box, along with a gun and plenty of ammo. I would also stow some seeds of edible plants, just in case i awoke to some kind of post apocalyptic scene where most of the people have starved to death and the few who remain live in fear of marauding bandits.
A water distiller also will come in handy, I own one that holds several gallons of water, with the still mechanism sitting on top to catch the water vapors as they are made from any heat source. The still is made of stainless steel so you can just stick it on a stove or campfire to generate fresh water from almost any source of water such as the ocean.
A multitool such as Leatherman Supertool, a Buck knife, and some fishing line and hooks would also go in.
A warm wool blanket and a coat would go in...