First, I drill two small holes about midway up the cap, I use an inexpensive Walmart rechargeable drill and a drill bit about the size of the string I'm using which is pink Mason line I believe it's called, its from home depot it's a few dollars for hundreds of feet. Then I take the line and thread one end thru one of the holes then tie a big knot on the end so it can't be pulled out of the cap then do the same for the other side then make sure the knot is pulled up against the edge of the cap then I usually glue the knots down to the cap then fill it with hot glue to the top then I carefully put it in my freezer for a few minutes and you're done. I really hope this is helpful to someone. I saw something similar online and thought it was a good idea... it's a pretty simple process and the materials are pretty inexpensive if you have any questions I would try to answer them.
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