OK, here’s what you need to start. Actually, it’s just a few things. First, you need the item you want to keep dry, like an opened bag of rice, flour, or sugar. You also need a plastic bottle with a screw-on top. A medium-sized water bottle works perfectly. Also, you’ll need a pair of scissors or a sharp kitchen knife. And finally, a kitchen towel.
Grab yerself a vessel, whatever you like. Aluminum handled bowls like this speckled one (reowr) work great. Also grab a dozen glue sticks, your trusty hot glue gun, and 50 to 75 feet of sisal rope (mine was ¼ inch thick).