The following is from Alyssa Vera on IG (but it came in an email newsletter, so I can’t just directly link to it).
So, first of all. When it comes to witch bottles, the number one rule is that they cannot be opened. Their magic would be gone otherwise!
Then, as usual, keep in mind that we’re talking about YOUR jar. So, as long as you keep it safe, you should follow your intuition. And if you feel the need to place it in a particular place, then it’s okay to do it.
However, the purpose of your bottle is also essential when it comes to picking the best spot, which possibly should be a dark one. A few examples? You can place your love jar under your own bed. Or you can hide your healing bottle in a sick person’s room.
If you’ve prepared a defensive jar, you can bury it in your yard or at a crossroads. Why? A buried bottle is symbolically linked to the protection provided by Mother Earth, and a crossroads has been historically considered a place of mystery and magic.
Likewise, you can throw your bottle into a lake, river, or sea. Just remember that this is technically littering, so please don’t overdo it! Also, keep in mind that you should bury or sink only witch bottles whose spell you don’t want to reverse.
My favorite option? Turning my bottle (it must be a little one) into a talisman by hiding it in my bag and carrying its magic with me wherever I go.
As for me… I usually put them in “relevant” areas, but that can be kind of subjective. I have a couple of dream and protection ones next to our bed, for example. Then I have some creative and prosperity ones on my desk where I work my day job, play, and work on my personal projects. My Hekate one is in the Hekate area of my altar. I have another psychic/divination-focused one next to my tarot deck. Hmm… What else…
Oh, I also have a drawer with a few I’ve made, but I kind of made them with the intention of gifting them to others, and that’s why they don’t have places in our home. I’ve just put that on hold for now, as I’ve found out how expensive shipping overseas is.