This sounds like a great idea, but how do you keep it from being "drained" or hydrated?

Immediately take them out of the oven and store in the smallest airtight container you have. Obviously they'll absorb the humidity in the container and whatever is introduced anytime you open it. Ideally, keep them in containers that have an excellent seal and minimal internal volume like quality ESD bags.

Throw them in a container with some silica gel.

In a "ziplock" bag which you have vacuumed all the air out of.

If they're not getting hydrated slowly, they're not serving any purpose. The whole point is that water goes into them instead of whatever you're trying to keep dry.

other people are suggesting the microwave rather than the oven. to my mind it seems very possible that you don't keep them from hydrating, you just dehydrate them on-demand.

I store mine in an plastic box with airtight lid designed for food storage.