well the water is freezing here again like its going out of fashion.
Have now tried two socks and two layers of tin foil still frozen!
So today I have purchased some bubble wrap, so now trying sock then bubble wrap x2 layers then another sock.
Some one had a idea of them back pain sticky things that warm up or put one of them hand warmers between the socks, easier if you have the bottle like mine as its cube shaped, not sure how you would do it if you have the standard shape.
I will post more ideas if this does not work tonight.
Has any one tried glycerine in there water seen a few sites suggesting this, does it work???