See if you can get silica gel desiccant beads in bulk. It's pretty easy to get 20kg bags on line where I am.
Try to avoid the purple ones, I've read that the chemical that turns them purple is classified as a carcinogen in the EU.
Pour a layer of beads on the bottom of big box with a lid. The lid also keeps odors in while drying.
Find some wire mesh or something to lay your buds on that allows for air to circulate and keep the buds off the beads.
Keep in mind the buds will shrink and fall through the mesh as it dries.
I used to use the rack from an oven till I got a dehumidifier.
Stick a small computer fan in the box to get some air to circulate.
Close up the box let the beads suck the moisture out of the system. A moisture meter in the box would also help if you have one.
You might have to change out the beads every day or so depending on how much water your taking out of the system.
You can reuse the beads after baking them in the oven at ~120c for an hour or so.