as of late i have been using Xikar humidity jars. they take up very little room and they are inexpensive while still holding a solid RH. also they are rechargeable to a degree.
Heartfelt Industries (google it) - I'd get a 4oz tube and be done with it - you won't regret it.
They come charged, so just put it in your humi.
You might even only need a 2oz tube - there is a "calculator" page which tells you how much you need, based on the sq.in. volume of your humi.
I do NOT charge my beads. I use 65% beads, dry, and put a small bowl (like a custard cup) with about 1/4 to 1/2 inch of distilled water in the humidor near the beads. I then let the beads do what they're designed to do. When my RH gets above 65%, I remove the bowl. End of lesson.
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They come charged, so just put it in your humi.
You might even only need a 2oz tube - there is a "calculator" page which tells you how much you need, based on the sq.in. volume of your humi.