I have seen a product that coats the handles of metal tools to give you a better grip. Seems to me that would work well.

Here is a link that might be useful: plasti Dip

That stuff works great. We use it on our tool handles. Once it's open , it seems to dry up really fast. Gather up alot of things to coat all at the same time.

he re bar will not hurt your bottle. I have used thinner to thin down the plastic coating when it gets a little dry.

I dropped a bottle a little hard over a piece of rebar and had broken glass all over. I use a dab of adhesive putty now on the end of the rebar before I put a bottle on it. (The same stuff you use to stick pictures, etc to the wall or woodwork--you get it in just about any store in the stationery dept). It works fine, and lasts a long time since the bottle protects it and it never gets wet. Modeling clay or something like it would work too.

Sandy

Hot glue gun.