Orchids don't have mouths. Do you mean the flowers? They don't absorb nutrients from that. Supposedly some orchids can absorb nutrients through their leaves, but the roots are a much better bet. If you mean the spot where all the leaves come together on monopodal orchids, where new leaves grow from, do NOT put anything there. Water in the crown for too long will cause them to rot. I would just put tiny amounts of very dilute fertilizer on the roots of anything that wants it, since carnivorous plants can handle a tiny bit of fertilizer in the soil fine. Especially nepenthes.
Putting the necklace in a watertight pot will mean you'll have to be very careful not to overwater it. It may not be the best choice for a carnivorous plant environment. Not least because I'm pretty sure that's a desert plant, and if so, it'll want to dry out completely between waterings. It may not like the high humidity, either.
If the food turns into goo/mold on your sundews, that was too much food at one time. Try freeze-dried daphnia instead, they're a fine dust.
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