Any thoughts on the subject?

A little more than a year back, I purchased my own barrel of OWA. I've been using the barrel like a side table in my home office - just rolled it in and stood it on end.

One of the rings has slipped off and another is loose - the dry barrel seems to be shrinking. Curious if anybody has any tips for keeping an empty barrel together. Do I need to put a little water in it to keep the staves humid? Varnish it? Or if i slide the ring back in place and hold it with a screw will I be good for another ten years?