Can I reuse dessicant?
Desiccants eventually saturate with moisture, making them ineffective. This can be reversed, usually by heating the packs - various "recipes" for reheating are quoted, depending on the kind of desiccant pack; for those filled with silica gel temperatures of around 130-140 degrees celsius in a well ventilated (eg slightly opened) oven (moist atmosphere does not help) seem to be common, with time dependent on the packet size.

Some types seem to have a color indicator built into the material to indicate when it is dry again, with others weighing the packets (they get heavier when having absorbed moisture) can help.

If food use is intended, be extra careful there are no plastic parts or coatings in the packet construction that you could melt or burn with oven heat.

Microwave based methods are sometimes mentioned, if you want to try them, make sure you are prepared to handle the situation safely in case one of the packet/s (the paper, not the silica gel inside) catches fire. Also, if the model of microwave is not allowed to run empty, add some food or other load (a mug of water might create too much steam inside).