This one is pretty cheap and silver-lined, insulated.
http://www.amazon.com/gp/product/B0016L74Q0
I have put frozen water bottles in this one on 95+ hot Texas days and had to pull them out after 2hrs and keep them in the bottle cage to get them to thaw enough to drink.
http://www.amazon.com/gp/product/B0016L74Q0