This is a simple camera case desiccant pack from things I had lying around the house. I keep my DSLR in a pelican case all the time so I don't have to worry about banging it into things, the weather, floods, running it over with my car etc...but I've noticed that sometimes when it's humid outside, or if I come inside from being outdoors on a cold day, the camera case can build up moisture inside of it. To prevent this, here's how to make a desiccant pack from stuff you've maybe already got on hand.
Step 1: Materials and Tools
It doesn't get much more basic than this folks.
Desiccant pack - those little paper or plastic pouches filled with silica gel that come in new pairs of shoes, electronics equipment and lots of other stuff that's at risk for being damaged by moisture.
Altoids tin - I'm using the mini tin because I don't have a very big camera case, but if yours is bigger think about using a full size tin.
Drill and a small bit.